feat: implement ERP AI Assistant Phase 1

Backend (FastAPI + SQLAlchemy + Claude API + RAG):
- Config management with Pydantic v2
- Database engine with connection pooling and SQL injection prevention
- AI engine with Claude API integration (support custom base URL)
- RAG engine with ChromaDB and sentence-transformers
- Requirement analysis service
- Config generation service
- Executor engine with SQL validation
- REST API endpoints: /analyze, /generate, /execute

Frontend (Vue 3 + Element Plus + Pinia):
- Complete 3-step workflow: analyze → generate → execute
- Step indicator with progress visualization
- Analysis result display with field table
- SQL preview with monospace font
- Execute confirmation dialog with safety warning
- Execution result display
- State management with Pinia
- API service integration

Security:
- SQL injection prevention with parameterized queries
- Dangerous SQL operation blocking
- Database password URL encoding
- Transaction auto-rollback
- Pydantic config validation

Features:
- Natural language requirement analysis
- Automated SQL configuration generation
- Safe execution with human review
- LAN access support
- Custom Claude API endpoint support

Documentation:
- README with quick start guide
- Quick start guide
- LAN access configuration
- Dependency fixes guide
- Claude API configuration
- Git operation guide
- Implementation report

Dependencies fixed:
- numpy<2.0.0 for chromadb compatibility
- sentence-transformers==2.7.0 for huggingface_hub compatibility

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/tests/test_config_service.py

@@ -0,0 +1,94 @@
+"""Tests for Config Service.
+
+This module tests the ConfigService class for configuration generation.
+"""
+
+import pytest
+from unittest.mock import MagicMock, AsyncMock, patch
+from app.services.config_service import ConfigService
+
+
+@pytest.mark.asyncio
+async def test_generate_config():
+    """Test config generation with mocked dependencies."""
+    with patch('app.services.config_service.ClaudeEngine') as MockClaudeEngine, \
+         patch('app.services.config_service.RAGEngine') as MockRAGEngine, \
+         patch('app.services.config_service.DatabaseEngine') as MockDBEngine:
+
+        # Setup mocks
+        mock_ai_engine = MagicMock()
+        mock_ai_engine.call_claude = AsyncMock(return_value='{"配置方案": {"sql_list": ["INSERT INTO SYS_FORM..."]}}')
+        mock_ai_engine.parse_json_response = MagicMock(return_value={
+            "配置方案": {
+                "sql_list": ["INSERT INTO SYS_FORM VALUES (...)"]
+            }
+        })
+        MockClaudeEngine.return_value = mock_ai_engine
+
+        mock_rag_engine = MagicMock()
+        mock_rag_engine.search = MagicMock(return_value=[
+            {"content": "Sample rule", "metadata": {}}
+        ])
+        MockRAGEngine.return_value = mock_rag_engine
+
+        MockDBEngine.return_value = MagicMock()
+
+        # Create service and test
+        service = ConfigService()
+
+        requirements = {
+            "功能名称": "销售订单",
+            "功能号建议": "11-001",
+            "窗体类型": "5",
+            "主表名建议": "SA_ORDER",
+            "主表字段": [
+                {"字段名": "订单号", "字段类型": "varchar(50)", "必填": True}
+            ]
+        }
+
+        result = await service.generate(requirements, "test-session")
+
+        assert result is not None
+        assert "配置方案" in result
+
+
+@pytest.mark.asyncio
+async def test_get_platform_rules():
+    """Test platform rules retrieval."""
+    with patch('app.services.config_service.ClaudeEngine'), \
+         patch('app.services.config_service.RAGEngine') as MockRAGEngine, \
+         patch('app.services.config_service.DatabaseEngine'):
+
+        mock_rag_engine = MagicMock()
+        mock_rag_engine.search = MagicMock(return_value=[
+            {"content": "Rule 1"},
+            {"content": "Rule 2"}
+        ])
+        MockRAGEngine.return_value = mock_rag_engine
+
+        service = ConfigService()
+        rules = service._get_platform_rules("5")
+
+        assert "Rule 1" in rules
+        assert "Rule 2" in rules
+
+
+@pytest.mark.asyncio
+async def test_get_similar_cases():
+    """Test similar cases retrieval."""
+    with patch('app.services.config_service.ClaudeEngine'), \
+         patch('app.services.config_service.RAGEngine') as MockRAGEngine, \
+         patch('app.services.config_service.DatabaseEngine'):
+
+        mock_rag_engine = MagicMock()
+        mock_rag_engine.search = MagicMock(return_value=[
+            {"content": "Case 1"},
+            {"content": "Case 2"}
+        ])
+        MockRAGEngine.return_value = mock_rag_engine
+
+        service = ConfigService()
+        cases = service._get_similar_cases("销售订单")
+
+        assert "Case 1" in cases
+        assert "Case 2" in cases