fix(ci): Runner 暫存目錄清理 - 永久修復

- 每個 Job 開始前清理 $RUNNER_TEMP/*
- 新增 crontab 每小時自動清理
- 新增 ~/bin/runner-cleanup.sh 腳本

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

.github/workflows/cd.yaml

@@ -55,6 +55,12 @@ jobs:
     runs-on: [self-hosted, harbor, k8s]
     timeout-minutes: 1
     steps:
+      # 2026-03-26: 清理暫存目錄，避免 set_output file conflict
+      - name: "Clean Runner temp"
+        run: |
+          rm -rf "$RUNNER_TEMP"/* 2>/dev/null || true
+          rm -rf .claude/worktrees 2>/dev/null || true
+
       - name: "Check Required Secrets"
         run: |
           MISSING=""
@@ -103,8 +109,9 @@ jobs:
       api: ${{ inputs.force_deploy == true && 'true' || steps.filter.outputs.api }}
       web: ${{ inputs.force_deploy == true && 'true' || steps.filter.outputs.web }}
     steps:
-      - name: Clean worktrees
-        run: rm -rf .claude/worktrees 2>/dev/null || true
+      # 2026-03-26: 清理暫存目錄
+      - name: "Clean Runner temp"
+        run: rm -rf "$RUNNER_TEMP"/* .claude/worktrees 2>/dev/null || true
 
       - uses: actions/checkout@v4
         with:
@@ -138,6 +145,10 @@ jobs:
     outputs:
       image_tag: ${{ steps.tag.outputs.tag }}
     steps:
+      # 2026-03-26: 清理暫存目錄
+      - name: "Clean Runner temp"
+        run: rm -rf "$RUNNER_TEMP"/* .claude/worktrees 2>/dev/null || true
+
       - uses: actions/checkout@v4
 
       - name: Generate tag
@@ -170,6 +181,10 @@ jobs:
     outputs:
       image_tag: ${{ steps.tag.outputs.tag }}
     steps:
+      # 2026-03-26: 清理暫存目錄
+      - name: "Clean Runner temp"
+        run: rm -rf "$RUNNER_TEMP"/* .claude/worktrees 2>/dev/null || true
+
       - uses: actions/checkout@v4
 
       - name: Generate tag
@@ -209,8 +224,9 @@ jobs:
     if: always() && (needs.build-api.result == 'success' || needs.build-api.result == 'skipped') && (needs.build-web.result == 'success' || needs.build-web.result == 'skipped')
     environment: production
     steps:
-      - name: Clean worktrees
-        run: rm -rf .claude/worktrees 2>/dev/null || true
+      # 2026-03-26: 清理暫存目錄
+      - name: "Clean Runner temp"
+        run: rm -rf "$RUNNER_TEMP"/* .claude/worktrees 2>/dev/null || true
 
       - uses: actions/checkout@v4
         with: