feat: integrate Grafana dashboards into BOC DashboardPage

- Add Infrastructure Health section with CPU/Memory/Disk panels
- Add Service Status section with PM2/Docker panels
- Create GrafanaPanel component for iframe embedding
- Build passes successfully

backend/models/auth.go

@@ -0,0 +1,11 @@
+package models
+
+import "github.com/golang-jwt/jwt/v5"
+
+// Claims represents JWT token claims
+type Claims struct {
+	UserID string `json:"user_id"`
+	Email  string `json:"email"`
+	Role   string `json:"role"`
+	jwt.RegisteredClaims
+}