feat(migration): implement interactive mapping resolution workflow

- Add SQLite database integration for environments and mappings
- Update TaskManager to support pausing tasks (AWAITING_MAPPING)
- Modify MigrationPlugin to detect missing mappings and wait for resolution
- Add frontend UI for handling missing mappings interactively
- Create dedicated migration routes and API endpoints
- Update .gitignore and project documentation

backend/requirements.txt

@@ -9,4 +9,6 @@ requests
 keyring
 httpx
 PyYAML
-websockets
+websockets
+rapidfuzz
+sqlalchemy