Fixes 10 issues from Blueprint extension code review:
- CurseForge API key now reads via Blueprint dbGet() matching admin save
- PRO-tier fields (webhook, interval) enforced server-side, not just UI
- json_decode results validated before accessing parsed data
- Null user guard on getStatus() endpoint
- 429 response uses consistent error key format
- Modrinth slug derivation strips special chars, documented as fallback
- Check interval dropdown reflects saved value
- API key input changed to password type
- TypeScript error typing narrowed from any to unknown
- Removed unused DB import from ModpackApiService
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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