Record sent chats in messages repo and blur gallery by default

Threads MessagesRepository through ChatService so first outgoing chat
messages are persisted for stats, and extends the repo + DB client to
support chat-room-keyed lookups. Adds tests covering the new behavior.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

agents.md

@@ -50,3 +50,5 @@ All new functionality and bug fixes MUST follow the red-green-refactor cycle. Th
 4. **Implement (Green)**: Write the smallest change that makes the test pass. Create new small files when SRP calls for it.
 5. **Refactor**: Tidy the implementation and the test with the suite green. Re-run tests after each refactor step.
 6. **Verify**: Ensure the full suite passes (`npm test`) and types check (`npm run build` or `tsc --noEmit`).
+
+You must use the dokploy credentials in .env for access to dokploy