Fix production error related to missing user group creation date

Address the 'column user_groups.created_at does not exist' error in production by adjusting the getUserWithGroups query and ensuring admin authentication is functional.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 54292eb6-296c-47a3-8f4e-c9967863556c
Replit-Commit-Checkpoint-Type: full_checkpoint

server/storage.ts

@@ -1999,9 +1999,13 @@ class MemStorage implements IStorage {
   async deletePermission(): Promise<void> {}
   async getRolePermissions(): Promise<any[]> { return []; }
   async setRolePermissions(): Promise<void> {}
-  async getUserRoles(): Promise<any[]> { return []; }
   async setUserRoles(): Promise<void> {}
-  async getUserPermissions(): Promise<any[]> { return []; }
+  async assignUserToGroup(userGroup: { groupId: number; userId: string; }): Promise<{ createdAt: Date | null; groupId: number; userId: string; }> {
+    return { ...userGroup, createdAt: new Date() };
+  }
+  async removeUserFromGroup(): Promise<void> {}
+  async getMonthlyStats(): Promise<any> { return {}; }
+  async getNocodbConfigs(): Promise<any[]> { return []; }
 }
 
 // Use MemStorage in development, DatabaseStorage in production