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/src/app.py

@@ -20,7 +20,11 @@ import os
 
 from .dependencies import get_task_manager
 from .core.logger import logger
-from .api.routes import plugins, tasks, settings
+from .api.routes import plugins, tasks, settings, environments, mappings
+from .core.database import init_db
+
+# Initialize database
+init_db()
 
 # [DEF:App:Global]
 # @SEMANTICS: app, fastapi, instance
@@ -45,6 +49,8 @@ app.add_middleware(
 app.include_router(plugins.router, prefix="/api/plugins", tags=["Plugins"])
 app.include_router(tasks.router, prefix="/api/tasks", tags=["Tasks"])
 app.include_router(settings.router, prefix="/api/settings", tags=["Settings"])
+app.include_router(environments.router)
+app.include_router(mappings.router)
 
 # [DEF:WebSocketEndpoint:Endpoint]
 # @SEMANTICS: websocket, logs, streaming, real-time