ci(foundation): 恢复混合标签策略，验证通过的稳定配置

- validate/frontend-lint: ubuntu-22.04（docker模式，环境干净）
- deploy/e2e: saas（host模式，有完整工具链）
- runner capacity已扩容到30，不怕actions测试任务抢资源

.gitea/workflows/auto-merge.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   auto-merge:
-    runs-on: saas
+    runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
       - name: Checkout code

.gitea/workflows/ci-cd.yml

@@ -22,7 +22,7 @@ permissions:
 jobs:
   validate:
     name: Validate Code Quality And Tests
-    runs-on: saas
+    runs-on: ubuntu-22.04
     timeout-minutes: 10
 
     env:
@@ -198,7 +198,7 @@ jobs:
 
   frontend-lint:
     name: Frontend Lint
-    runs-on: saas
+    runs-on: ubuntu-22.04
     timeout-minutes: 10
 
     steps: