Clean up stale project assets and tighten Docker/nginx config (#231)

### Summary
This branch removes stale project files and unused assets, updates
outdated docs/config examples, and tightens Docker/nginx behavior around
health checks, CSP, and startup ordering.

### What changed

**Cleanup**
- Remove unused iOS legacy imagesets.
- Remove unused web public icons.
- Remove unused web localizations.
- Drop stale personal IDE config files and rename the module from
`pastedrop` to `pastepoint`.
- Remove dead server file-transfer error variants.
- Fix stale ignore entries for the web Karma config filename.

**Docker & health checks**
- Pin the cert-checker image to `alpine:3.21`.
- Make the server healthcheck use HTTPS against `/health`.
- Make the web container healthcheck target `/health`.
- Gate SSR startup on the backend becoming healthy instead of merely
started.

**Nginx**
- Serve `/health` from the default port-80 server so Docker healthchecks
resolve correctly.
- Remove dead redirect config.
- Tighten CSP `connect-src` by removing the plain `ws://` allowance.
- Clean up the access-log field name for request timing.

**Scripts & CI**
- Resolve the cert output directory relative to the repo root so
`generate-certs.sh` works from any current directory.
- Pass Angular’s production configuration through npm correctly in the
web CI build.

**Docs / env examples**
- Update stale web README sections for locales, environment files, and
Angular build tooling.
- Fix the server README run-configuration example.
- Remove the unused `BUILD_MODE` env example entries.

Author: SloMR

.dockerignore

@@ -49,7 +49,7 @@ LICENSE
 
 # Ignore test/coverage files
 client/web/coverage
-client/web/karma.conf.js
+client/web/karma.conf.cjs
 
 # Ignore OS-specific files
 .hg

.env.development.example

@@ -11,7 +11,6 @@ CONTAINER_USER=nobody
 SERVER_ENV=docker-dev
 
 # Build Configuration for Development
-BUILD_MODE=development
 NPM_BUILD_CONFIG=docker-dev
 RUST_BUILD_MODE=debug
 

.env.production.example

@@ -12,7 +12,6 @@ CONTAINER_USER=nobody
 SERVER_ENV=production
 
 # Build Configuration for Production
-BUILD_MODE=production
 NPM_BUILD_CONFIG=docker
 RUST_BUILD_MODE=release
 

.github/workflows/web.yml

@@ -83,4 +83,4 @@ jobs:
 
       - name: Production Build
         working-directory: client/web
-        run: npm run build --configuration=production
+        run: npm run build -- --configuration=production