fix(cd): 序列建構修復 Runner _runner_file_commands 衝突

根因: 並行 Job 的 Set up job 階段會同時寫入 RUNNER_TEMP
解法: build-api needs build-web，確保序列執行
移除: Job-level concurrency groups (不再需要)
更新: ops/runner/README.md v1.0→v2.0

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/cd.yaml

@@ -1,11 +1,11 @@
 # =============================================================================
-# AWOOOI CD Pipeline v2.0 (完整沿用 AIOPS 最佳實踐)
+# AWOOOI CD Pipeline v2.1 (序列建構修復 Runner 衝突)
 # =============================================================================
 # 優化項目:
 # 1. Pre-flight Check (10s Fail-Fast)
 # 2. Runner 標籤 [self-hosted, harbor, k8s]
 # 3. dorny/paths-filter 精確路徑偵測
-# 4. API + Web 並行建構
+# 4. Web → API 序列建構 (2026-03-29 修復 _runner_file_commands 衝突)
 # 5. timeout-minutes 防止卡死
 # 6. Telegram + OpenClaw 通知
 # 7. force_deploy 強制重建選項
@@ -57,11 +57,6 @@ jobs:
     name: "Pre-flight Check"
     runs-on: [self-hosted, harbor, k8s]
     timeout-minutes: 1
-    # 2026-03-29: Runner 全局 mutex，確保同一 Runner 不會並行執行任何 CD Job
-    # 使用固定 group 名稱 (非 run_id)，所有 CD Jobs 共用同一把鎖
-    concurrency:
-      group: runner-awoooi-cd-mutex
-      cancel-in-progress: false
     steps:
       # =======================================================================
       # 2026-03-29: Runner _diag/pages 檔案衝突修復 (v3)
@@ -135,9 +130,6 @@ jobs:
     runs-on: [self-hosted, harbor, k8s]
     needs: pre-flight-check
     timeout-minutes: 1
-    concurrency:
-      group: runner-awoooi-cd-mutex
-      cancel-in-progress: false
     outputs:
       api: ${{ inputs.force_deploy == true && 'true' || steps.filter.outputs.api }}
       web: ${{ inputs.force_deploy == true && 'true' || steps.filter.outputs.web }}
@@ -171,15 +163,15 @@ jobs:
             k3s-system:
               - 'k8s/k3s-system/**'
 
-  # ==================== 並行建構 API ====================
+  # ==================== 序列建構 API (必須等 Web 完成) ====================
+  # 2026-03-29 Claude Code: 改為序列執行，修復 Runner _runner_file_commands 衝突
+  # 根因: 並行 Job 的 "Set up job" 階段會互相覆寫 RUNNER_TEMP 檔案
+  # 參考: ops/runner/README.md
   build-api:
     name: "Build API"
     runs-on: [self-hosted, harbor, k8s]
-    needs: detect-changes
+    needs: [detect-changes, build-web]
     timeout-minutes: 20
-    concurrency:
-      group: runner-awoooi-cd-mutex
-      cancel-in-progress: false
     if: |
       !inputs.skip_api && (
         needs.detect-changes.outputs.api == 'true' ||
@@ -214,15 +206,13 @@ jobs:
             --file apps/api/Dockerfile .
           echo "✅ API: ${{ env.REGISTRY }}/${{ env.IMAGE_PREFIX }}-api:${{ steps.tag.outputs.tag }}"
 
-  # ==================== 並行建構 Web ====================
+  # ==================== 建構 Web (先執行) ====================
+  # 2026-03-29 Claude Code: API 依賴 Web 完成，確保序列執行
   build-web:
     name: "Build Web"
     runs-on: [self-hosted, harbor, k8s]
     needs: detect-changes
     timeout-minutes: 20
-    concurrency:
-      group: runner-awoooi-cd-mutex
-      cancel-in-progress: false
     if: |
       !inputs.skip_web && (
         needs.detect-changes.outputs.web == 'true' ||