feat: bump typescript (#14507)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Chores**
  * Upgraded TypeScript toolchain to v5.9.3 across packages and tooling.
* Removed legacy ts-node and migrated developer tooling to newer
runtimes (tsx/SWC) where applicable.
* **Documentation**
* Updated developer CLI docs and runtime behavior notes to reflect the
new loader/runtime for running TypeScript files; no changes to public
APIs or end-user behavior.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/base/config/__tests__/config.spec.ts

@@ -2,8 +2,8 @@ import test from 'ava';
 
 import { createModule } from '../../../__tests__/create-module';
 import { InvalidAppConfig } from '../../error';
-import { ConfigFactory, ConfigModule } from '..';
 import { Config } from '../config';
+import { ConfigFactory, ConfigModule } from '../index';
 import { override } from '../register';
 
 const module = await createModule();

packages/backend/server/src/base/job/queue/__tests__/queue.spec.ts

@@ -8,8 +8,8 @@ import Sinon from 'sinon';
 import { createTestingModule } from '../../../../__tests__/utils';
 import { ConfigModule } from '../../../config';
 import { metrics } from '../../../metrics';
-import { JobModule, JobQueue, OnJob } from '..';
 import { JobExecutor } from '../executor';
+import { JobModule, JobQueue, OnJob } from '../index';
 import { JobHandlerScanner } from '../scanner';
 
 let module: TestingModule;