Implement AuthGuard for route protection, integrate authorization checks into particles route, and simplify HeaderComponent access logic. Remove redundant debug logging in auth.service.ts.

frontend/src/app/guards/auth.guard.ts

@@ -0,0 +1,41 @@
+import {Injectable} from '@angular/core';
+import {ActivatedRouteSnapshot, CanActivate, Router, RouterStateSnapshot, UrlTree} from '@angular/router';
+import {Observable} from 'rxjs';
+import {AuthService} from '@services/auth.service';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class AuthGuard implements CanActivate {
+
+  constructor(
+    private authService: AuthService,
+    private router: Router
+  ) {
+  }
+
+  canActivate(
+    route: ActivatedRouteSnapshot,
+    state: RouterStateSnapshot
+  ): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
+
+    if (!this.authService.checkAuthStatus()) {
+      return this.router.createUrlTree(['/']);
+    }
+
+    const requiredAuthorizations = route.data['requiredAuthorizations'] as string[];
+
+    if (!requiredAuthorizations || requiredAuthorizations.length === 0) {
+      return true;
+    }
+
+    const userAuthorizations = this.authService.getUserAuthorizations();
+    const hasAccess = requiredAuthorizations.some(auth => userAuthorizations.includes(auth));
+
+    if (!hasAccess) {
+      return this.router.createUrlTree(['/']);
+    }
+
+    return true;
+  }
+}