feat(pkb): Complete PKB module frontend migration with V3 design

Summary:
- Implement PKB Dashboard and Workspace pages based on V3 prototype
- Add single-layer header with integrated Tab navigation
- Implement 3 work modes: Full Text, Deep Read, Batch Processing
- Integrate Ant Design X Chat component for AI conversations
- Create BatchModeComplete with template selection and document processing
- Add compact work mode selector with dropdown design

Backend:
- Migrate PKB controllers and services to /modules/pkb structure
- Register v2 API routes at /api/v2/pkb/knowledge
- Maintain dual API routes for backward compatibility

Technical details:
- Use Zustand for state management
- Handle SSE streaming responses for AI chat
- Support document selection for Deep Read mode
- Implement batch processing with progress tracking

Known issues:
- Batch processing API integration pending
- Knowledge assets page navigation needs optimization

Status: Frontend functional, pending refinement

backend/test-pkb-migration.http

@@ -0,0 +1,159 @@
+###
+# PKB模块迁移 - API测试脚本
+# 测试v1和v2路由的功能完整性和一致性
+###
+
+@baseUrl = http://localhost:3000
+@userId = user-mock-001
+
+### ============================================
+### 阶段3.1: 健康检查
+### ============================================
+
+### 1. PKB v2健康检查
+GET {{baseUrl}}/api/v2/pkb/health
+Accept: application/json
+
+### ============================================
+### 阶段3.2: 知识库CRUD测试
+### ============================================
+
+### 2. 获取知识库列表（v1）
+GET {{baseUrl}}/api/v1/knowledge-bases
+Accept: application/json
+
+### 3. 获取知识库列表（v2）
+GET {{baseUrl}}/api/v2/pkb/knowledge/knowledge-bases
+Accept: application/json
+
+### 4. 创建知识库（v2）
+POST {{baseUrl}}/api/v2/pkb/knowledge/knowledge-bases
+Content-Type: application/json
+
+{
+  "name": "测试知识库v2-{{$timestamp}}",
+  "description": "这是一个通过v2 API创建的测试知识库"
+}
+
+### 5. 创建知识库（v1 - 对比）
+POST {{baseUrl}}/api/v1/knowledge-bases
+Content-Type: application/json
+
+{
+  "name": "测试知识库v1-{{$timestamp}}",
+  "description": "这是一个通过v1 API创建的测试知识库"
+}
+
+### 6. 获取知识库详情（v2）
+# 替换为实际的知识库ID
+@kbId = f6ebe476-c50f-4222-83d2-c2525edc6054
+GET {{baseUrl}}/api/v2/pkb/knowledge/knowledge-bases/{{kbId}}
+Accept: application/json
+
+### 7. 获取知识库详情（v1 - 对比）
+GET {{baseUrl}}/api/v1/knowledge-bases/{{kbId}}
+Accept: application/json
+
+### 8. 更新知识库（v2）
+PUT {{baseUrl}}/api/v2/pkb/knowledge/knowledge-bases/{{kbId}}
+Content-Type: application/json
+
+{
+  "name": "更新后的知识库名称v2",
+  "description": "通过v2 API更新的描述"
+}
+
+### 9. 获取知识库统计（v2）
+GET {{baseUrl}}/api/v2/pkb/knowledge/knowledge-bases/{{kbId}}/stats
+Accept: application/json
+
+### 10. 获取知识库统计（v1 - 对比）
+GET {{baseUrl}}/api/v1/knowledge-bases/{{kbId}}/stats
+Accept: application/json
+
+### ============================================
+### 阶段3.3: RAG检索测试
+### ============================================
+
+### 11. RAG检索（v2）
+GET {{baseUrl}}/api/v2/pkb/knowledge/knowledge-bases/{{kbId}}/search?query=阿尔兹海默症的治疗方法&top_k=5
+Accept: application/json
+
+### 12. RAG检索（v1 - 对比）
+GET {{baseUrl}}/api/v1/knowledge-bases/{{kbId}}/search?query=阿尔兹海默症的治疗方法&top_k=5
+Accept: application/json
+
+### ============================================
+### 阶段3.4: 文档选择（全文阅读模式）
+### ============================================
+
+### 13. 获取文档选择（v2）
+GET {{baseUrl}}/api/v2/pkb/knowledge/knowledge-bases/{{kbId}}/document-selection?max_files=7&max_tokens=750000
+Accept: application/json
+
+### 14. 获取文档选择（v1 - 对比）
+GET {{baseUrl}}/api/v1/knowledge-bases/{{kbId}}/document-selection?max_files=7&max_tokens=750000
+Accept: application/json
+
+### ============================================
+### 阶段3.5: 文档管理测试
+### ============================================
+
+### 15. 获取文档列表（通过知识库详情）
+GET {{baseUrl}}/api/v2/pkb/knowledge/knowledge-bases/{{kbId}}
+Accept: application/json
+
+### 16. 获取单个文档详情（v2）
+# 替换为实际的文档ID
+@docId = your-document-id
+GET {{baseUrl}}/api/v2/pkb/knowledge/documents/{{docId}}
+Accept: application/json
+
+### ============================================
+### 阶段3.6: 批处理功能测试
+### ============================================
+
+### 17. 获取批处理模板（v2）
+GET {{baseUrl}}/api/v2/pkb/batch-tasks/batch/templates
+Accept: application/json
+
+### 18. 创建批处理任务（v2）
+POST {{baseUrl}}/api/v2/pkb/batch-tasks/batch/execute
+Content-Type: application/json
+
+{
+  "kb_id": "{{kbId}}",
+  "document_ids": [],
+  "template_type": "preset",
+  "template_id": "clinical_research_method",
+  "model_type": "deepseek-v3",
+  "task_name": "测试批处理任务v2"
+}
+
+### ============================================
+### 阶段3.7: 边界条件测试
+### ============================================
+
+### 19. 测试不存在的知识库（v2）
+GET {{baseUrl}}/api/v2/pkb/knowledge/knowledge-bases/00000000-0000-0000-0000-000000000000
+Accept: application/json
+
+### 20. 测试无效的查询参数（v2）
+GET {{baseUrl}}/api/v2/pkb/knowledge/knowledge-bases/{{kbId}}/search?query=&top_k=0
+Accept: application/json
+
+### 21. 测试超大top_k参数（v2）
+GET {{baseUrl}}/api/v2/pkb/knowledge/knowledge-bases/{{kbId}}/search?query=测试&top_k=1000
+Accept: application/json
+
+### ============================================
+### 阶段3.8: 清理测试数据（可选）
+### ============================================
+
+### 22. 删除测试知识库（v2）
+# @testKbId = 从创建响应中获取的ID
+DELETE {{baseUrl}}/api/v2/pkb/knowledge/knowledge-bases/{{testKbId}}
+
+###
+
+