feat: Implement UVM Dashboard with frontend and backend integration

- Added dashboard.js for frontend functionality, including VM management and system health monitoring.
- Created dashboard route to serve the dashboard HTML.
- Introduced diagnostics route for token-protected host diagnostics.
- Enhanced VMs router with bulk actions, VM log retrieval, and port management.
- Updated lifecycle service to read VM log tails with truncation handling.
- Integrated static file serving for dashboard assets in the FastAPI server.
- Redirect root URL to the dashboard for improved user experience.

uvm/routers/diagnostics.py

@@ -0,0 +1,18 @@
+"""Token-protected host diagnostics endpoint."""
+
+from __future__ import annotations
+
+from fastapi import APIRouter, Depends
+
+from ..api_models import DiagnosticResponse
+from ..app import Application
+from .dependencies import get_authorized_application
+
+router = APIRouter(tags=["diagnostics"])
+
+
+@router.get("/diagnostics", response_model=list[DiagnosticResponse])
+def diagnostics(
+    application: Application = Depends(get_authorized_application),
+) -> list[DiagnosticResponse]:
+    return [DiagnosticResponse(**check) for check in application.lifecycle.diagnostics()]