feat(ai): add ADR-036 unified OCR architecture and frontend test coverage

- Add ADR-036 unified OCR architecture (typhoon-ocr via Ollama)
- Extend AI execution profiles for OCR sandbox configuration
- Add comprehensive frontend test coverage (components, hooks, services)
- Add backend test coverage for document-numbering services
- Update OCR sidecar with typhoon-ocr integration
- Add AI policy service and execution profile management
- Update AGENTS.md and architecture documentation

frontend/__tests__/helpers/api-mock.ts

@@ -0,0 +1,24 @@
+// File: frontend/__tests__/helpers/api-mock.ts
+// Change Log
+// - 2026-06-13: Add shared API client mock shape assertions for frontend tests.
+
+import { expect, type Mock } from 'vitest';
+
+type ApiClientMock = {
+  get: Mock;
+  post: Mock;
+  put: Mock;
+  patch: Mock;
+  delete: Mock;
+};
+
+/**
+ * ตรวจสอบว่า apiClient mock จาก vitest.setup.ts มี method ครบตาม pattern กลาง
+ */
+export function expectApiClientMockShape(apiClient: ApiClientMock): void {
+  expect(apiClient.get).toBeTypeOf('function');
+  expect(apiClient.post).toBeTypeOf('function');
+  expect(apiClient.put).toBeTypeOf('function');
+  expect(apiClient.patch).toBeTypeOf('function');
+  expect(apiClient.delete).toBeTypeOf('function');
+}