feat: implement frontend-backend configuration linkage

- Create public config API for frontend consumption
- Add configuration fetching to homepage
- Implement module show/hide logic based on config
- Add support for Services items filtering
- Add support for Products featured products and pricing display
- Add support for News display count, categories, and sort order
- Fix table name from 'configs' to 'siteConfig' in API route
- Update type definitions for proper TypeScript support

src/db/schema.test.ts

@@ -8,15 +8,15 @@ describe('Database Schema', () => {
       expect(users.email).toBeDefined();
       expect(users.passwordHash).toBeDefined();
       expect(users.name).toBeDefined();
-      expect(users.role).toBeDefined();
+      expect(users.isAdmin).toBeDefined();
       expect(users.avatar).toBeDefined();
       expect(users.createdAt).toBeDefined();
       expect(users.updatedAt).toBeDefined();
     });
 
-    it('should have default role as editor', () => {
-      const role = users.role;
-      expect(role).toBeDefined();
+    it('should have default isAdmin as false', () => {
+      const isAdmin = users.isAdmin;
+      expect(isAdmin).toBeDefined();
     });
   });