fix(mcp): persist blocked gateway audit rows

apps/api/src/plugins/mcp/gateway.py

@@ -39,7 +39,7 @@ import hashlib
 import json
 import time
 from dataclasses import dataclass, field
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from typing import Any
 from uuid import UUID
 
@@ -47,6 +47,7 @@ import structlog
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
+from src.core.redis_client import get_redis
 from src.db.awooop_models import (
     AwoooPActiveRevision,
     AwoooPMcpGatewayAudit,
@@ -54,7 +55,6 @@ from src.db.awooop_models import (
     AwoooPMcpToolRegistry,
     AwoooPProject,
 )
-from src.core.redis_client import get_redis
 from src.plugins.mcp.interfaces import MCPToolResult
 from src.plugins.mcp.registry import get_provider_registry
 
@@ -278,7 +278,7 @@ class McpGateway:
         self, ctx: GatewayContext, gate_result: GateCheckResult
     ) -> tuple[AwoooPMcpToolRegistry, AwoooPMcpGrant]:
         """Gate 3：tool 在白名單 + grant 有效（未到期、未撤銷）"""
-        now = datetime.now(timezone.utc)
+        now = datetime.now(UTC)
 
         # 查 tool registry
         tool_result = await self._db.execute(
@@ -458,9 +458,8 @@ class McpGateway:
                 latency_ms=latency_ms,
             )
 
-            if tool_row is not None:
-                self._db.add(audit)
-                await self._db.flush()
+            self._db.add(audit)
+            await self._db.flush()
         except Exception as exc:
             logger.warning(
                 "mcp_gateway_audit_write_failed",