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/handlers/auth.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/golang-jwt/jwt/v5"
 	"golang.org/x/crypto/bcrypt"
+	"boc/models"
 )
 
 const tokenExpiry = 24 * time.Hour
@@ -17,13 +18,6 @@ type AuthHandler struct {
 	JWTSecret []byte
 }
 
-type Claims struct {
-	UserID string `json:"user_id"`
-	Email  string `json:"email"`
-	Role   string `json:"role"`
-	jwt.RegisteredClaims
-}
-
 type loginRequest struct {
 	Email    string `json:"email"`
 	Password string `json:"password"`
@@ -72,7 +66,7 @@ func (h *AuthHandler) Login(w http.ResponseWriter, r *http.Request) {
 	}
 
 	now := time.Now()
-	claims := Claims{
+	claims := models.Claims{
 		UserID: id,
 		Email:  req.Email,
 		Role:   role,
@@ -102,7 +96,7 @@ func (h *AuthHandler) Login(w http.ResponseWriter, r *http.Request) {
 }
 
 func (h *AuthHandler) Me(w http.ResponseWriter, r *http.Request) {
-	claims, ok := r.Context().Value("user").(*Claims)
+	claims, ok := r.Context().Value("user").(*models.Claims)
 	if !ok {
 		writeError(w, http.StatusUnauthorized, "unauthorized")
 		return