fix: complete better-sqlite3 to bun:sqlite migration

Must Fix:
- Remove better-sqlite3 logic from smart-install.js (5 sections)
- Update all documentation to reference bun:sqlite (7 files)

Should Fix:
- Add defensive break statement in worker-cli.ts:38

Nice to Have:
- Add port validation in ProcessManager.start() (1024-65535)
- Add one-time marker for PM2 cleanup migration
- Verify clearPortCache() wiring (already correct)

Addresses PR #248 review feedback (comment #3648517713)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

docs/public/hooks-architecture.mdx

@@ -85,7 +85,6 @@ Claude-Mem uses 6 lifecycle hook scripts across 5 lifecycle events, plus 1 pre-h
 2. Only runs `npm install` when necessary:
    - First-time installation
    - Version changed in package.json
-   - Critical dependency missing (better-sqlite3)
 3. Provides Windows-specific error messages
 4. Starts Bun worker service