fix(ci): gosec 跳过自动生成的代码文件避免扫描超时

为 gosec 添加 -exclude-generated 标志，跳过带有
"// Code generated" 注释的文件（如 wire_gen.go），
防止安全扫描因分析自动生成代码而超时。

.github/workflows/security-scan.yml

@@ -34,7 +34,7 @@ jobs:
         run: |
           go install github.com/securego/gosec/v2/cmd/gosec@latest
           # exclude ent/ — auto-generated ORM code, not subject to manual security review
-          gosec -conf .gosec.json -severity high -confidence high -exclude-dir=ent ./...
+          gosec -conf .gosec.json -severity high -confidence high -exclude-generated -exclude-dir=ent ./...
 
   frontend-security:
     runs-on: ubuntu-latest