Fix runtime/server tests by adding missing app.init() calls

Added await app.init() to test setup in:
- node.test.ts
- rest.test.ts
- graphql.test.ts
- rest-advanced.test.ts

These tests were failing because ObjectQL v4.0 requires initialization before use.

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

packages/runtime/server/test/graphql.test.ts

@@ -146,6 +146,8 @@ describe('GraphQL API Adapter', () => {
                 }
             }
         });
+        
+        await app.init();
 
         // Create handler and server once for all tests
         handler = createGraphQLHandler(app);

packages/runtime/server/test/node.test.ts

@@ -51,6 +51,8 @@ describe('Node Adapter', () => {
                 }
             }
         });
+        
+        await app.init();
     });
 
     it('should handle find request', async () => {

packages/runtime/server/test/rest-advanced.test.ts

@@ -133,6 +133,8 @@ describe('REST API Error Handling & Edge Cases', () => {
                 }
             }
         });
+        
+        await app.init();
 
         handler = createRESTHandler(app);
         server = createServer(handler);

packages/runtime/server/test/rest.test.ts

@@ -201,6 +201,8 @@ describe('REST API Adapter', () => {
                 }
             }
         });
+        
+        await app.init();
 
         // Create handler and server once for all tests
         handler = createRESTHandler(app);