feat: add system health diagnostics

backend/app/system_health/frontend.py

@@ -0,0 +1,35 @@
+"""Authenticated frontend routes for System Health."""
+
+from pathlib import Path
+from typing import Annotated
+
+from fastapi import APIRouter, Depends
+from fastapi.responses import HTMLResponse, Response
+
+from app.frontend.views import render_app_page
+from app.identity import require_permission, user_has_permission
+
+
+router = APIRouter(tags=["frontend"])
+STATIC_ROOT = Path(__file__).parents[1] / "frontend" / "static"
+SystemHealthUser = Annotated[dict, Depends(require_permission("system_health.view"))]
+
+
+@router.get("/assets/minerops-system-health.css", include_in_schema=False)
+def system_health_styles() -> Response:
+    return Response((STATIC_ROOT / "system-health.css").read_text(encoding="utf-8"),
+                    media_type="text/css", headers={"Cache-Control": "no-store"})
+
+
+@router.get("/assets/minerops-system-health.js", include_in_schema=False)
+def system_health_script() -> Response:
+    return Response((STATIC_ROOT / "system-health.js").read_text(encoding="utf-8"),
+                    media_type="text/javascript", headers={"Cache-Control": "no-store"})
+
+
+@router.get("/system-health", response_class=HTMLResponse, include_in_schema=False)
+def system_health_page(current_user: SystemHealthUser) -> str:
+    return render_app_page(
+        "system_health", current_user,
+        lambda permission: user_has_permission(current_user, permission),
+    )