Fix app:dev CLI by removing deleted createOneApplication mutation (#18460)

## Summary
- The `createOneApplication` GraphQL mutation was removed from the
server during the application architecture refactor (#18432), but the
SDK CLI (`app:dev`, `app:build --sync`) still called it, causing
failures.
- Simplified the SDK to use `syncApplication` (which now internally
creates the `ApplicationEntity` via `ensureApplicationExists`) instead
of a separate create step.
- On first run (clean install), the orchestrator now runs an initial
sync before initializing the file uploader, so file uploads can proceed
(they require the `ApplicationEntity` to exist).

## Test plan
- [x] Typecheck passes for both `twenty-sdk` and `twenty-server`
- [x] `app:dev` tested locally with existing app (finds app, uploads,
syncs)
- [x] `app:dev` tested locally after `app:uninstall` (creates app via
sync, uploads, syncs)
- [x] SDK unit tests pass (23/26 files, 3 pre-existing failures
unrelated)

Made with [Cursor](https://cursor.com)

packages/twenty-sdk/src/cli/__tests__/integration/utils/run-app-dev-in-process.util.ts

@@ -19,7 +19,7 @@ export const runAppDevInProcess = async (options: {
 
   const command = new AppDevCommand();
 
-  await command.execute({ appPath });
+  await command.execute({ appPath, headless: true });
 
   const startTime = Date.now();
 

packages/twenty-sdk/src/cli/__tests__/integration/utils/setup-app-dev-mocks.ts

@@ -2,10 +2,6 @@ import { vi } from 'vitest';
 
 const mockApiService = {
   validateAuth: vi.fn().mockResolvedValue({ authValid: true, serverUp: true }),
-  findOneApplication: vi.fn().mockResolvedValue({ success: true, data: null }),
-  createApplication: vi
-    .fn()
-    .mockResolvedValue({ success: true, data: { id: 'mock-id' } }),
   generateApplicationToken: vi.fn().mockResolvedValue({
     success: true,
     data: {
@@ -39,6 +35,10 @@ const mockApiService = {
       clientSecret: 'mock-client-secret',
     },
   }),
+  createDevelopmentApplication: vi.fn().mockResolvedValue({
+    success: true,
+    data: { id: 'mock-app-id', universalIdentifier: 'mock-uid' },
+  }),
   syncApplication: vi.fn().mockResolvedValue({ success: true, data: true }),
   uploadFile: vi.fn().mockResolvedValue({ success: true, data: true }),
 };
@@ -46,14 +46,13 @@ const mockApiService = {
 vi.mock('@/cli/utilities/api/api-service', () => ({
   ApiService: class {
     validateAuth = mockApiService.validateAuth;
-    findOneApplication = mockApiService.findOneApplication;
-    createApplication = mockApiService.createApplication;
     generateApplicationToken = mockApiService.generateApplicationToken;
     renewApplicationToken = mockApiService.renewApplicationToken;
     findApplicationRegistrationByUniversalIdentifier =
       mockApiService.findApplicationRegistrationByUniversalIdentifier;
     createApplicationRegistration =
       mockApiService.createApplicationRegistration;
+    createDevelopmentApplication = mockApiService.createDevelopmentApplication;
     syncApplication = mockApiService.syncApplication;
     uploadFile = mockApiService.uploadFile;
   },