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/api/v1/schema_change.py

@@ -0,0 +1,45 @@
+from typing import Optional
+from fastapi import APIRouter, Depends, Query
+from sqlalchemy.orm import Session
+
+from app.core.database import get_db
+from app.models.user import User
+from app.schemas.common import ResponseModel, ListResponse
+from app.models.schema_change import SchemaChangeLog
+from app.api.deps import get_current_user
+
+router = APIRouter()
+
+
+@router.get("/logs")
+def list_schema_changes(
+    source_id: Optional[int] = Query(None),
+    change_type: Optional[str] = Query(None),
+    page: int = Query(1, ge=1),
+    page_size: int = Query(20, ge=1, le=500),
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    query = db.query(SchemaChangeLog)
+    if source_id:
+        query = query.filter(SchemaChangeLog.source_id == source_id)
+    if change_type:
+        query = query.filter(SchemaChangeLog.change_type == change_type)
+    total = query.count()
+    items = query.order_by(SchemaChangeLog.detected_at.desc()).offset((page - 1) * page_size).limit(page_size).all()
+    return ListResponse(
+        data=[{
+            "id": log.id,
+            "source_id": log.source_id,
+            "database_id": log.database_id,
+            "table_id": log.table_id,
+            "column_id": log.column_id,
+            "change_type": log.change_type,
+            "old_value": log.old_value,
+            "new_value": log.new_value,
+            "detected_at": log.detected_at.isoformat() if log.detected_at else None,
+        } for log in items],
+        total=total,
+        page=page,
+        page_size=page_size,
+    )