chore: add data snapshot, deployment compose, and CLAUDE.md

- Commit SQLite db snapshot (WAL checkpointed before copy)
- Replace upstream docker-compose with real deployment config
- Add CLAUDE.md documenting customization and deploy steps
- Gitignore secrets.json and SQLite temp files

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -59,5 +59,7 @@ drizzle/
 .vscode/
 .idea/
 
-# data
-/data
+# data — commit db snapshot but not secrets or SQLite temp files
+/data/secrets.json
+/data/db/*.db-wal
+/data/db/*.db-shm