fix: 修复CI/CD流程问题并建立监控机制

- 禁用Git LFS（项目未使用LFS）
- 修复企业微信通知环境变量展开问题
- 创建CI/CD诊断脚本
- 建立持续监控机制
- 添加预防措施文档

问题根本原因:
1. Woodpecker CI Git插件默认启用LFS，导致不必要的LFS命令执行
2. Shell脚本heredoc块内变量展开时机问题导致环境变量丢失

修复方案:
1. 在clone配置中添加 lfs: false
2. 将环境变量赋值移到单独的命令行，heredoc仅用于生成JSON

验证方法:
- 运行 diagnose-cicd-issues.sh 进行诊断
- 运行 scripts/monitoring/cicd-monitor.sh 进行监控

.woodpecker.yml

@@ -415,15 +415,14 @@ steps:
       WECHAT_WEBHOOK:
         from_secret: wechat_webhook
     commands:
+      - BRANCH="${CI_COMMIT_BRANCH:-unknown}"
+      - COMMIT="${CI_COMMIT_SHA:0:7}"
+      - MESSAGE=$(echo "${CI_COMMIT_MESSAGE:-no message}" | tr '\n' ' ' | sed 's/"/\\"/g')
+      - AUTHOR="${CI_COMMIT_AUTHOR:-unknown}"
+      - PIPELINE_NUMBER="${CI_PIPELINE_NUMBER:-0}"
+      - REPO_ID="${CI_REPO_ID:-1}"
+      - TIMESTAMP=$(date "+%Y-%m-%d %H:%M:%S")
       - |
-        BRANCH="${CI_COMMIT_BRANCH:-unknown}"
-        COMMIT="${CI_COMMIT_SHA:0:7}"
-        MESSAGE=$(echo "${CI_COMMIT_MESSAGE:-no message}" | tr '\n' ' ')
-        AUTHOR="${CI_COMMIT_AUTHOR:-unknown}"
-        PIPELINE_NUMBER="${CI_PIPELINE_NUMBER:-0}"
-        REPO_ID="${CI_REPO_ID:-1}"
-        TIMESTAMP=$(date "+%Y-%m-%d %H:%M:%S")
-        
         cat > /tmp/payload.json <<EOF
         {
           "msgtype": "markdown",
@@ -432,10 +431,7 @@ steps:
           }
         }
         EOF
-        
-        curl -X POST "$WECHAT_WEBHOOK" \
-          -H 'Content-Type: application/json' \
-          -d @/tmp/payload.json
+      - curl -X POST "$WECHAT_WEBHOOK" -H 'Content-Type: application/json' -d @/tmp/payload.json
     when:
       event:
         - push
@@ -451,15 +447,14 @@ steps:
       WECHAT_WEBHOOK:
         from_secret: wechat_webhook
     commands:
+      - BRANCH="${CI_COMMIT_BRANCH:-unknown}"
+      - COMMIT="${CI_COMMIT_SHA:0:7}"
+      - MESSAGE=$(echo "${CI_COMMIT_MESSAGE:-no message}" | tr '\n' ' ' | sed 's/"/\\"/g')
+      - AUTHOR="${CI_COMMIT_AUTHOR:-unknown}"
+      - PIPELINE_NUMBER="${CI_PIPELINE_NUMBER:-0}"
+      - REPO_ID="${CI_REPO_ID:-1}"
+      - TIMESTAMP=$(date "+%Y-%m-%d %H:%M:%S")
       - |
-        BRANCH="${CI_COMMIT_BRANCH:-unknown}"
-        COMMIT="${CI_COMMIT_SHA:0:7}"
-        MESSAGE=$(echo "${CI_COMMIT_MESSAGE:-no message}" | tr '\n' ' ')
-        AUTHOR="${CI_COMMIT_AUTHOR:-unknown}"
-        PIPELINE_NUMBER="${CI_PIPELINE_NUMBER:-0}"
-        REPO_ID="${CI_REPO_ID:-1}"
-        TIMESTAMP=$(date "+%Y-%m-%d %H:%M:%S")
-        
         cat > /tmp/payload.json <<EOF
         {
           "msgtype": "markdown",
@@ -468,10 +463,7 @@ steps:
           }
         }
         EOF
-        
-        curl -X POST "$WECHAT_WEBHOOK" \
-          -H 'Content-Type: application/json' \
-          -d @/tmp/payload.json
+      - curl -X POST "$WECHAT_WEBHOOK" -H 'Content-Type: application/json' -d @/tmp/payload.json
     when:
       event:
         - push
@@ -497,3 +489,4 @@ clone:
     settings:
       depth: 1
       partial: false
+      lfs: false