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/lib/services/__tests__/search.service.test.ts

@@ -0,0 +1,50 @@
+// File: frontend/lib/services/__tests__/search.service.test.ts
+// Change Log:
+// - 2026-06-13: Initial creation - test coverage for searchService
+
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import apiClient from '@/lib/api/client';
+import { searchService } from '../search.service';
+
+describe('searchService', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  describe('search', () => {
+    it('ควรส่งคำขอ GET /search พร้อมข้อมูลการค้นหาสำเร็จ', async () => {
+      const mockResult = { items: [{ publicId: '019505a1-7c3e-7000-8000-doc111111111', title: 'Test doc' }] };
+      vi.mocked(apiClient.get).mockResolvedValue({ data: mockResult });
+      const query = { q: 'test', limit: 10, offset: 0 };
+      const result = await searchService.search(query);
+      expect(apiClient.get).toHaveBeenCalledWith('/search', { params: query });
+      expect(result).toEqual(mockResult);
+    });
+  });
+
+  describe('suggest', () => {
+    it('ควรดึงข้อมูล suggest และแกะค่า items ออกมาสำเร็จ', async () => {
+      const mockResult = { items: ['test1', 'test2'] };
+      vi.mocked(apiClient.get).mockResolvedValue({ data: mockResult });
+      const result = await searchService.suggest('test');
+      expect(apiClient.get).toHaveBeenCalledWith('/search', { params: { q: 'test', limit: 5 } });
+      expect(result).toEqual(['test1', 'test2']);
+    });
+
+    it('ควรคืนค่า raw response ใน suggest หากไม่มีฟิลด์ items', async () => {
+      const mockResult = ['test1', 'test2'];
+      vi.mocked(apiClient.get).mockResolvedValue({ data: mockResult });
+      const result = await searchService.suggest('test');
+      expect(result).toEqual(['test1', 'test2']);
+    });
+  });
+
+  describe('reindex', () => {
+    it('ควรส่งคำขอ POST เพื่อสั่ง reindex สำเร็จ', async () => {
+      vi.mocked(apiClient.post).mockResolvedValue({ data: { success: true } });
+      const result = await searchService.reindex('correspondence');
+      expect(apiClient.post).toHaveBeenCalledWith('/search/reindex', { type: 'correspondence' });
+      expect(result).toEqual({ success: true });
+    });
+  });
+});