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>

app/api/admin/auth/me/route.ts

@@ -4,7 +4,7 @@ import { getCurrentAdmin } from '@/lib/admin-auth';
 
 export const runtime = 'nodejs';
 
-export async function GET() {
+export async function GET(request: Request) {
   try {
     console.log('Admin auth check - starting...');
 
@@ -21,7 +21,7 @@ export async function GET() {
       );
     }
 
-    const admin = await getCurrentAdmin();
+    const admin = await getCurrentAdmin(request as any);
     console.log('Admin user found:', !!admin);
 
     if (!admin) {