docs: replace OIDC provider examples with comprehensive setup guide

- Removed the outdated OIDC provider examples document.
- Introduced a new OIDC provider setup guide detailing configuration steps for various providers.
- Enhanced documentation includes authorization modes, troubleshooting tips, and security best practices.
- Added new images to support the updated guide and improve user understanding.

Author: elibosley

api/docs/public/images/advanced-rules.png

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+---
+title: OIDC Provider Setup
+description: Configure OIDC (OpenID Connect) providers for SSO authentication in Unraid API
+sidebar_position: 3
+---
+
+# OIDC Provider Setup
+
+This guide walks you through configuring OIDC (OpenID Connect) providers for SSO authentication in the Unraid API using the web interface.
+
+## Accessing OIDC Settings
+
+1. Navigate to your Unraid server's web interface
+2. The OIDC Providers section is available on the main configuration page
+3. You'll see tabs for different providers - click the **+** button to add a new provider
+
+### OIDC Providers Interface Overview
+
+![Login Page with SSO Options](./images/sso-with-options.png)
+_Screenshot: Login page showing traditional login form with SSO options - "Login With Unraid.net" and "Sign in with Google" buttons_
+
+The interface includes:
+
+- **Provider tabs**: Each configured provider (Unraid.net, Google, etc.) appears as a tab
+- **Add Provider button**: Click the **+** button to add new providers
+- **Authorization Mode dropdown**: Toggle between "simple" and "advanced" modes
+- **Simple Authorization section**: Configure allowed email domains and specific addresses
+- **Add Item buttons**: Click to add multiple authorization rules
+
+## Understanding Authorization Modes
+
+The interface provides two authorization modes:
+
+### Simple Mode (Recommended)
+
+Simple mode is the easiest way to configure authorization. You can:
+
+- Allow specific email domains (e.g., @company.com)
+- Allow specific email addresses
+- Configure who can access your Unraid server with minimal setup
+
+**When to use Simple Mode:**
+
+- You want to allow all users from your company domain
+- You have a small list of specific users
+- You're new to OIDC configuration
+
+<details>
+<summary><strong>Advanced Mode</strong></summary>
+
+Advanced mode provides granular control using claim-based rules. You can:
+
+- Create complex authorization rules based on JWT claims
+- Use operators like equals, contains, endsWith, startsWith
+- Combine multiple conditions with OR/AND logic
+- Choose whether ANY rule must pass (OR mode) or ALL rules must pass (AND mode)
+
+**When to use Advanced Mode:**
+
+- You need to check group memberships
+- You want to verify multiple claims (e.g., email domain AND verified status)
+- You have complex authorization requirements
+- You need fine-grained control over how rules are evaluated
+
+</details>
+
+## Authorization Rules
+
+![Authorization Rules Configuration](./images/advanced-rules.png)
+_Screenshot: Advanced authorization rules showing JWT claim configuration with email endsWith operator for domain-based access control_
+
+### Simple Mode Examples
+
+#### Allow Company Domain
+
+In Simple Authorization:
+
+- **Allowed Email Domains**: Enter `company.com`
+- This allows anyone with @company.com email
+
+#### Allow Specific Users
+
+- **Specific Email Addresses**: Add individual emails
+- Click **Add Item** to add multiple addresses
+
+<details>
+<summary><strong>Advanced Mode Examples</strong></summary>
+
+#### Authorization Rule Mode
+
+When using multiple rules, you can choose how they're evaluated:
+
+- **OR Mode** (default): User is authorized if ANY rule passes
+- **AND Mode**: User is authorized only if ALL rules pass
+
+#### Email Domain with Verification (AND Mode)
+
+To require both email domain AND verification:
+
+1. Set **Authorization Rule Mode** to `AND`
+2. Add two rules:
+   - Rule 1:
+     - **Claim**: `email`
+     - **Operator**: `endsWith`
+     - **Value**: `@company.com`
+   - Rule 2:
+     - **Claim**: `email_verified`
+     - **Operator**: `equals`
+     - **Value**: `true`
+
+This ensures users must have both a company email AND a verified email address.
+
+#### Group-Based Access (OR Mode)
+
+To allow access to multiple groups:
+
+1. Set **Authorization Rule Mode** to `OR` (default)
+2. Add rules for each group:
+   - **Claim**: `groups`
+   - **Operator**: `contains`
+   - **Value**: `admins`
+   
+   Or add another rule:
+   - **Claim**: `groups`
+   - **Operator**: `contains`
+   - **Value**: `developers`
+
+Users in either `admins` OR `developers` group will be authorized.
+
+#### Multiple Domains
+
+- **Claim**: `email`
+- **Operator**: `endsWith`
+- **Values**: Add multiple domains (e.g., `company.com`, `subsidiary.com`)
+
+#### Complex Authorization (AND Mode)
+
+For strict security requiring multiple conditions:
+
+1. Set **Authorization Rule Mode** to `AND`
+2. Add multiple rules that ALL must pass:
+   - Email must be from company domain
+   - Email must be verified
+   - User must be in specific group
+   - Account must have 2FA enabled (if claim available)
+
+</details>
+
+<details>
+<summary><strong>Configuration Interface Details</strong></summary>
+
+### Provider Tabs
+
+- Each configured provider appears as a tab at the top
+- Click a tab to switch between provider configurations
+- The **+** button on the right adds a new provider
+
+### Authorization Mode Dropdown
+
+- **simple**: Best for email-based authorization (recommended for most users)
+- **advanced**: For complex claim-based rules using JWT claims
+
+### Simple Authorization Fields
+
+When "simple" mode is selected, you'll see:
+
+- **Allowed Email Domains**: Enter domains without @ (e.g., `company.com`)
+    - Helper text: "Users with emails ending in these domains can login"
+- **Specific Email Addresses**: Add individual email addresses
+    - Helper text: "Only these exact email addresses can login"
+- **Add Item** buttons to add multiple entries
+
+### Advanced Authorization Fields
+
+When "advanced" mode is selected, you'll see:
+
+- **Authorization Rule Mode**: Choose `OR` (any rule passes) or `AND` (all rules must pass)
+- **Authorization Rules**: Add multiple claim-based rules
+- **For each rule**:
+    - **Claim**: The JWT claim to check
+    - **Operator**: How to compare (equals, contains, endsWith, startsWith)
+    - **Value**: What to match against
+
+### Additional Interface Elements
+
+- **Enable Developer Sandbox**: Toggle to enable GraphQL sandbox at `/graphql`
+- The interface uses a dark theme for better visibility
+- Field validation indicators help ensure correct configuration
+
+</details>
+
+### Required Redirect URI
+
+All providers must be configured with this redirect URI:
+
+```
+http://YOUR_UNRAID_IP:3001/graphql/api/auth/oidc/callback
+```
+
+Replace `YOUR_UNRAID_IP` with your actual server IP address.
+
+### Issuer URL Format
+
+The **Issuer URL** field accepts both formats, but **base URL is strongly recommended** for security:
+
+- **Base URL** (recommended): `https://accounts.google.com`
+- **Full discovery URL**: `https://accounts.google.com/.well-known/openid-configuration`
+
+**⚠️ Security Note**: Always use the base URL format when possible. The system automatically appends `/.well-known/openid-configuration` for OIDC discovery. Using the full discovery URL directly disables important issuer validation checks and is not recommended by the OpenID Connect specification.
+
+**Examples of correct base URLs:**
+- Google: `https://accounts.google.com`
+- Microsoft/Azure: `https://login.microsoftonline.com/YOUR_TENANT_ID/v2.0`
+- Keycloak: `https://keycloak.example.com/realms/YOUR_REALM`
+- Authelia: `https://auth.yourdomain.com`
+
+## Testing Your Configuration
+
+![Login Page with SSO Buttons](./images/sso-with-options.png)
+_Screenshot: Unraid login page displaying both traditional username/password authentication and SSO options with customized provider buttons_
+
+1. Save your provider configuration
+2. Log out (if logged in)
+3. Navigate to the login page
+4. Your configured provider button should appear
+5. Click to test the login flow
+
+## Troubleshooting
+
+### Common Issues
+
+#### "Provider not found" error
+
+- Ensure the Issuer URL is correct
+- Check that the provider supports OIDC discovery (/.well-known/openid-configuration)
+
+#### "Authorization failed"
+
+- In Simple Mode: Check email domains are entered correctly (without @)
+- In Advanced Mode: 
+  - Verify claim names match exactly what your provider sends
+  - Check if Authorization Rule Mode is set correctly (OR vs AND)
+  - Ensure all required claims are present in the token
+- Enable debug logging to see actual claims and rule evaluation
+
+#### "Invalid redirect URI"
+
+- Ensure the redirect URI in your provider matches exactly
+- Include the port number (:3001)
+- Use HTTP for local, HTTPS for production
+
+#### Cannot see login button
+
+- Check that at least one authorization rule is configured
+- Verify the provider is enabled/saved
+
+### Debug Mode
+
+To troubleshoot issues:
+
+1. Enable debug logging:
+
+```bash
+LOG_LEVEL=debug unraid-api start --debug
+```
+
+2. Check logs for:
+
+- Received claims from provider
+- Authorization rule evaluation
+- Token validation errors
+
+## Security Best Practices
+
+1. **Always use HTTPS in production** - OAuth requires secure connections
+2. **Use Simple Mode for authorization** - Prevents overly accepting configurations and reduces misconfiguration risks
+3. **Be specific with authorization** - Don't use overly broad rules
+4. **Rotate secrets regularly** - Update client secrets periodically
+5. **Test thoroughly** - Verify only intended users can access
+
+## Need Help?
+
+- Check provider's OIDC documentation
+- Review Unraid API logs for detailed error messages
+- Ensure your provider supports standard OIDC discovery
+- Verify network connectivity between Unraid and provider
+
+## Provider-Specific Setup
+
+### Unraid.net Provider
+
+The Unraid.net provider is built-in and pre-configured. You only need to configure authorization rules in the interface.
+
+**Configuration:**
+- **Issuer URL**: Pre-configured (built-in provider)
+- **Client ID/Secret**: Pre-configured (built-in provider)
+- **Redirect URI**: `http://YOUR_UNRAID_IP:3001/graphql/api/auth/oidc/callback`
+
+Configure authorization rules using Simple Mode (allowed email domains/addresses) or Advanced Mode for complex requirements.
+
+### Google
+
+Set up OAuth credentials in [Google Cloud Console](https://console.cloud.google.com/). Create a new OAuth client ID with Web application type.
+
+**Configuration:**
+- **Issuer URL**: `https://accounts.google.com`
+- **Client ID/Secret**: From Google Cloud Console OAuth credentials
+- **Required Scopes**: `openid`, `profile`, `email`
+- **Redirect URI**: `http://YOUR_UNRAID_IP:3001/graphql/api/auth/oidc/callback`
+
+For Google Workspace, use Advanced Mode with `hd` claim to restrict to your domain.
+
+### Authelia
+
+Configure OIDC client in your Authelia `configuration.yml` with client ID `unraid-api` and generate a hashed secret using the Authelia hash-password command.
+
+**Configuration:**
+- **Issuer URL**: `https://auth.yourdomain.com`
+- **Client ID**: `unraid-api` (or as configured in Authelia)
+- **Client Secret**: Your unhashed secret
+- **Required Scopes**: `openid`, `profile`, `email`, `groups`
+- **Redirect URI**: `http://YOUR_UNRAID_IP:3001/graphql/api/auth/oidc/callback`
+
+Use Advanced Mode with `groups` claim for group-based authorization.
+
+### Microsoft/Azure AD
+
+Register a new app in [Azure Portal](https://portal.azure.com/) under Azure Active Directory → App registrations. Note the Application ID, create a client secret, and note your tenant ID.
+
+**Configuration:**
+- **Issuer URL**: `https://login.microsoftonline.com/YOUR_TENANT_ID/v2.0`
+- **Client ID**: Your Application (client) ID
+- **Client Secret**: Generated client secret
+- **Required Scopes**: `openid`, `profile`, `email`
+- **Redirect URI**: `http://YOUR_UNRAID_IP:3001/graphql/api/auth/oidc/callback`
+
+Authorization rules can be configured in the interface using email domains or advanced claims.
+
+### Keycloak
+
+Create a new confidential client in Keycloak Admin Console with `openid-connect` protocol and copy the client secret from the Credentials tab.
+
+**Configuration:**
+- **Issuer URL**: `https://keycloak.example.com/realms/YOUR_REALM`
+- **Client ID**: `unraid-api` (or as configured in Keycloak)
+- **Client Secret**: From Keycloak Credentials tab
+- **Required Scopes**: `openid`, `profile`, `email`
+- **Redirect URI**: `http://YOUR_UNRAID_IP:3001/graphql/api/auth/oidc/callback`
+
+For role-based authorization, use Advanced Mode with `realm_access.roles` or `resource_access` claims.
+
+### Authentik
+
+Create a new OAuth2/OpenID Provider in Authentik, then create an Application and link it to the provider.
+
+**Configuration:**
+- **Issuer URL**: `https://authentik.example.com/application/o/unraid-api/`
+- **Client ID**: From Authentik provider configuration
+- **Client Secret**: From Authentik provider configuration
+- **Required Scopes**: `openid`, `profile`, `email`
+- **Redirect URI**: `http://YOUR_UNRAID_IP:3001/graphql/api/auth/oidc/callback`
+
+Authorization rules can be configured in the interface.
+
+### Okta
+
+Create a new OIDC Web Application in Okta Admin Console and assign appropriate users or groups.
+
+**Configuration:**
+- **Issuer URL**: `https://YOUR_DOMAIN.okta.com`
+- **Client ID**: From Okta application configuration
+- **Client Secret**: From Okta application configuration
+- **Required Scopes**: `openid`, `profile`, `email`
+- **Redirect URI**: `http://YOUR_UNRAID_IP:3001/graphql/api/auth/oidc/callback`
+
+Authorization rules can be configured in the interface using email domains or advanced claims.