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/alembic/versions/007_add_watermark_log.py

@@ -0,0 +1,33 @@
+"""Add watermark_log table
+
+Revision ID: 007
+Revises: 006
+Create Date: 2026-04-23 18:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision: str = "007"
+down_revision: Union[str, None] = "006"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "watermark_log",
+        sa.Column("id", sa.Integer(), primary_key=True, index=True),
+        sa.Column("user_id", sa.Integer(), sa.ForeignKey("sys_user.id"), nullable=False),
+        sa.Column("export_type", sa.String(20), default="csv"),
+        sa.Column("data_scope", sa.Text(), nullable=True),
+        sa.Column("watermark_key", sa.String(64), nullable=False),
+        sa.Column("created_at", sa.DateTime(), default=sa.func.now()),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("watermark_log")