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/metadata.py

@@ -1,5 +1,5 @@
 from datetime import datetime
-from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey, Text, BigInteger
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey, Text, BigInteger, JSON
 from sqlalchemy.orm import relationship
 
 from app.core.database import Base
@@ -36,6 +36,10 @@ class Database(Base):
     charset = Column(String(50))
     table_count = Column(Integer, default=0)
     created_at = Column(DateTime, default=datetime.utcnow)
+    last_scanned_at = Column(DateTime, nullable=True)
+    checksum = Column(String(64), nullable=True)
+    is_deleted = Column(Boolean, default=False)
+    deleted_at = Column(DateTime, nullable=True)
 
     source = relationship("DataSource", back_populates="databases")
     tables = relationship("DataTable", back_populates="database", cascade="all, delete-orphan")
@@ -51,6 +55,10 @@ class DataTable(Base):
     row_count = Column(BigInteger, default=0)
     column_count = Column(Integer, default=0)
     created_at = Column(DateTime, default=datetime.utcnow)
+    last_scanned_at = Column(DateTime, nullable=True)
+    checksum = Column(String(64), nullable=True)
+    is_deleted = Column(Boolean, default=False)
+    deleted_at = Column(DateTime, nullable=True)
 
     database = relationship("Database", back_populates="tables")
     columns = relationship("DataColumn", back_populates="table", cascade="all, delete-orphan")
@@ -68,6 +76,10 @@ class DataColumn(Base):
     is_nullable = Column(Boolean, default=True)
     sample_data = Column(Text)  # JSON array of sample values
     created_at = Column(DateTime, default=datetime.utcnow)
+    last_scanned_at = Column(DateTime, nullable=True)
+    checksum = Column(String(64), nullable=True)
+    is_deleted = Column(Boolean, default=False)
+    deleted_at = Column(DateTime, nullable=True)
 
     table = relationship("DataTable", back_populates="columns")
 
@@ -81,6 +93,7 @@ class UnstructuredFile(Base):
     file_size = Column(BigInteger)
     storage_path = Column(String(500))
     extracted_text = Column(Text)
+    analysis_result = Column(JSON, nullable=True)  # JSON: {matches: [{rule_name, category, level, snippet}]}
     status = Column(String(20), default="pending")  # pending, processed, error
     created_by = Column(Integer, ForeignKey("sys_user.id"))
     created_at = Column(DateTime, default=datetime.utcnow)