refactor: encrypt fragments in SQLCipher DB, organize services into domain modules
- Move standalone fragment storage from unencrypted SQLite to the existing
encrypted SQLCipher database (journal_cache.db)
- Add IDatabaseSessionService/DatabaseSessionService for shared encrypted
connection management after authentication
- Update fragments table schema: nullable entry_id, add guid column
- Reorganize flat Services/ directory (28 files) into 9 domain modules:
Ai, Config, Database, Entries, Fragments, Logging, Sidecar, Speech, Vault
- Update all namespace declarations and using statements across all projects
- Update REFACTORING_SUMMARY.md with all changes
Co-Authored-By: Warp <agent@warp.dev>
f06c1d15bb