Fix Next.js 15 compatibility and TypeScript errors

- Update API route handlers to use async params for Next.js 15 compatibility
- Fix MUI DataGrid deprecated props (pageSize -> initialState.pagination)
- Replace Material-UI Grid components with Box for better compatibility
- Fix admin authentication system with proper request parameters
- Update permission constants to match available AdminPermission enum values
- Add missing properties to Page interface for type safety
- Update .gitignore to exclude venv/, import logs, and large data directories
- Optimize Next.js config to reduce memory usage during builds

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

lib/admin-auth.ts

@@ -1,9 +1,25 @@
 import { NextRequest } from 'next/server';
-import { verify } from 'jsonwebtoken';
+import { verify, sign } from 'jsonwebtoken';
 import { prisma } from '@/lib/db';
 
 const JWT_SECRET = process.env.JWT_SECRET || 'fallback-secret-key';
 
+export enum AdminPermission {
+  READ_USERS = 'read_users',
+  WRITE_USERS = 'write_users',
+  DELETE_USERS = 'delete_users',
+  READ_CONTENT = 'read_content',
+  WRITE_CONTENT = 'write_content',
+  DELETE_CONTENT = 'delete_content',
+  READ_ANALYTICS = 'read_analytics',
+  READ_CHAT = 'read_chat',
+  WRITE_CHAT = 'write_chat',
+  DELETE_CHAT = 'delete_chat',
+  SYSTEM_BACKUP = 'system_backup',
+  SYSTEM_HEALTH = 'system_health',
+  SUPER_ADMIN = 'super_admin'
+}
+
 export interface AdminUser {
   id: string;
   email: string;
@@ -61,4 +77,75 @@ export function hasAdminAccess(user: AdminUser | null): boolean {
 
 export function isSuperAdmin(user: AdminUser | null): boolean {
   return user?.role === 'admin';
+}
+
+// Generate JWT token for admin authentication
+export function generateAdminToken(user: AdminUser): string {
+  return sign(
+    {
+      userId: user.id,
+      email: user.email,
+      role: user.role,
+      type: 'admin'
+    },
+    JWT_SECRET,
+    { expiresIn: '24h' }
+  );
+}
+
+// Get current admin from request
+export async function getCurrentAdmin(request: NextRequest): Promise<AdminUser | null> {
+  return await verifyAdminAuth(request);
+}
+
+// Check if user has specific permission
+export function hasPermission(user: AdminUser | null, permission: AdminPermission): boolean {
+  if (!user) return false;
+
+  // Super admin has all permissions
+  if (user.role === 'admin') return true;
+
+  // Define moderator permissions
+  const moderatorPermissions = [
+    AdminPermission.READ_USERS,
+    AdminPermission.WRITE_USERS,
+    AdminPermission.READ_CONTENT,
+    AdminPermission.WRITE_CONTENT,
+    AdminPermission.DELETE_CONTENT,
+    AdminPermission.READ_ANALYTICS,
+    AdminPermission.READ_CHAT,
+    AdminPermission.WRITE_CHAT
+  ];
+
+  // Check if moderator has the requested permission
+  if (user.role === 'moderator') {
+    return moderatorPermissions.includes(permission);
+  }
+
+  return false;
+}
+
+// Get user permissions based on role
+export function getUserPermissions(user: AdminUser | null): AdminPermission[] {
+  if (!user) return [];
+
+  if (user.role === 'admin') {
+    // Admin has all permissions
+    return Object.values(AdminPermission);
+  }
+
+  if (user.role === 'moderator') {
+    return [
+      AdminPermission.READ_USERS,
+      AdminPermission.WRITE_USERS,
+      AdminPermission.READ_CONTENT,
+      AdminPermission.WRITE_CONTENT,
+      AdminPermission.DELETE_CONTENT,
+      AdminPermission.READ_ANALYTICS,
+      AdminPermission.READ_CHAT,
+      AdminPermission.WRITE_CHAT
+    ];
+  }
+
+  return [];
 }