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/middleware/auth.go

@@ -7,7 +7,7 @@ import (
 
 	"github.com/golang-jwt/jwt/v5"
 	"boc/config"
-	"boc/handlers"
+	"boc/models"
 )
 
 func Auth(cfg *config.Config) func(http.Handler) http.Handler {
@@ -26,7 +26,7 @@ func Auth(cfg *config.Config) func(http.Handler) http.Handler {
 			}
 			tokenString := strings.TrimPrefix(authHeader, "Bearer ")
 
-			token, err := jwt.ParseWithClaims(tokenString, &handlers.Claims{}, func(token *jwt.Token) (interface{}, error) {
+			token, err := jwt.ParseWithClaims(tokenString, &models.Claims{}, func(token *jwt.Token) (interface{}, error) {
 				return []byte(cfg.JWTSecret), nil
 			})
 			if err != nil || !token.Valid {
@@ -34,7 +34,7 @@ func Auth(cfg *config.Config) func(http.Handler) http.Handler {
 				return
 			}
 
-			claims, ok := token.Claims.(*handlers.Claims)
+			claims, ok := token.Claims.(*models.Claims)
 			if !ok {
 				writeError(w, http.StatusUnauthorized, "invalid claims")
 				return