feat: 全量功能模块开发与集成测试修复

- 新增后端模块：Alert、APIAsset、Compliance、Lineage、Masking、Risk、SchemaChange、Unstructured、Watermark
- 新增前端模块页面与API接口
- 新增Alembic迁移脚本(002-014)覆盖全量业务表
- 新增测试数据生成脚本与集成测试脚本
- 修复metadata模型JSON类型导入缺失导致启动失败的问题
- 修复前端Alert/APIAsset页面request模块路径错误
- 更新docker-compose与开发计划文档

backend/app/models/api_asset.py

@@ -0,0 +1,41 @@
+from sqlalchemy import Column, Integer, String, Text, DateTime, Boolean, JSON, ForeignKey, BigInteger
+from sqlalchemy.orm import relationship
+from app.core.database import Base
+from datetime import datetime
+
+class APIAsset(Base):
+    __tablename__ = "api_asset"
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String(200), nullable=False)
+    base_url = Column(String(500), nullable=False)
+    swagger_url = Column(String(500), nullable=True)
+    auth_type = Column(String(50), default="none")  # none, bearer, api_key, basic
+    headers = Column(JSON, default=dict)
+    description = Column(Text, nullable=True)
+    scan_status = Column(String(20), default="idle")  # idle, scanning, completed, failed
+    total_endpoints = Column(Integer, default=0)
+    sensitive_endpoints = Column(Integer, default=0)
+    created_by = Column(Integer, ForeignKey("sys_user.id"), nullable=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    endpoints = relationship("APIEndpoint", back_populates="asset", cascade="all, delete-orphan")
+    creator = relationship("User", foreign_keys=[created_by])
+
+class APIEndpoint(Base):
+    __tablename__ = "api_endpoint"
+    id = Column(Integer, primary_key=True, index=True)
+    asset_id = Column(Integer, ForeignKey("api_asset.id"), nullable=False)
+    method = Column(String(10), nullable=False)  # GET, POST, PUT, DELETE, etc.
+    path = Column(String(500), nullable=False)
+    summary = Column(String(500), nullable=True)
+    tags = Column(JSON, default=list)
+    parameters = Column(JSON, default=list)
+    request_body_schema = Column(JSON, nullable=True)
+    response_schema = Column(JSON, nullable=True)
+    sensitive_fields = Column(JSON, default=list)  # detected PII fields
+    risk_level = Column(String(20), default="low")  # low, medium, high, critical
+    is_active = Column(Boolean, default=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+
+    asset = relationship("APIAsset", back_populates="endpoints")