feat(observability): Add comprehensive monitoring with Prometheus and OpenTelemetry

- Add Prometheus metrics for HTTP, MCP tools, Nextcloud API, OAuth, vector sync, and DB operations
- Add OpenTelemetry distributed tracing with OTLP export
- Add structured JSON logging with trace context correlation
- Add ObservabilityMiddleware for automatic HTTP instrumentation
- Add app_name attribute to all client classes for per-app metrics
- Add configuration for metrics, tracing, and logging via environment variables
- Add documentation in docs/observability.md
- Fix graceful degradation when tracing is disabled (default state)
- Fix uvicorn logging configuration to use observability formatters

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

nextcloud_mcp_server/client/notes.py

@@ -11,6 +11,8 @@ logger = logging.getLogger(__name__)
 class NotesClient(BaseNextcloudClient):
     """Client for Nextcloud Notes app operations."""
 
+    app_name = "notes"
+
     async def get_settings(self) -> Dict[str, Any]:
         """Get Notes app settings."""
         response = await self._make_request("GET", "/apps/notes/api/v1/settings")