chore: add GitHub PR template

[nathanialhenniges]

Summary

Adds a production-ready GitHub PR template (.github/PULL_REQUEST_TEMPLATE.md) to standardize pull request quality across the project.

Type of change

• chore — build, deps, config

Related issues

N/A

Implementation notes

Template is structured so reviewers can skip inapplicable sections quickly (DB migration gate, Discord-specific checks are marked "skip if not applicable"). All checklist items map directly to CI jobs or known failure modes in this codebase:

• DB migration section guards against schema changes landing without a migration file
• Discord checklist enforces channels.fetch over .cache.get, Promise.allSettled for batch ops, premium gate, and shard-safety
• CI checklist mirrors the exact jobs in .github/workflows/ci.yml (tests, lint, typecheck, Docker build)

Database migrations

N/A — no schema changes.

Discord-specific checklist

N/A — documentation/config only.

CI checklist

• bun test passes
• bun run lint:check passes
• bun run typecheck passes

Breaking changes

None.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 717c609a-0f7a-4240-822b-8de4034edb3b

📥 Commits

Reviewing files that changed from the base of the PR and between 3fa76c1 and 5caf351.

📒 Files selected for processing (1)

• .github/PULL_REQUEST_TEMPLATE.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/quizzical-solomon-aa39f4

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