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/project.py

@@ -48,6 +48,10 @@ class ClassificationProject(Base):
     created_at = Column(DateTime, default=datetime.utcnow)
     updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
 
+    # Async classification tracking
+    celery_task_id = Column(String(100), nullable=True)
+    scan_progress = Column(Text, nullable=True)  # JSON: {"scanned": 0, "matched": 0, "total": 0}
+
     template = relationship("ClassificationTemplate")
     tasks = relationship("ClassificationTask", back_populates="project", cascade="all, delete-orphan")
     results = relationship("ClassificationResult", back_populates="project", cascade="all, delete-orphan")