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

diagnose-cicd-issues.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+
+echo "=========================================="
+echo "CI/CD 问题诊断脚本"
+echo "=========================================="
+echo ""
+
+echo "📋 问题1: Git LFS 配置检查"
+echo "----------------------------------------"
+if command -v git-lfs &> /dev/null; then
+    echo "✅ Git LFS 已安装"
+    git lfs version
+else
+    echo "❌ Git LFS 未安装"
+fi
+
+if [ -f ".gitattributes" ]; then
+    echo "✅ .gitattributes 文件存在"
+    cat .gitattributes
+else
+    echo "❌ .gitattributes 文件不存在（项目未使用LFS）"
+fi
+
+echo ""
+echo "📋 问题2: 环境变量检查"
+echo "----------------------------------------"
+echo "当前环境变量:"
+echo "  CI_COMMIT_BRANCH: ${CI_COMMIT_BRANCH:-未设置}"
+echo "  CI_COMMIT_SHA: ${CI_COMMIT_SHA:-未设置}"
+echo "  CI_COMMIT_MESSAGE: ${CI_COMMIT_MESSAGE:-未设置}"
+echo "  CI_COMMIT_AUTHOR: ${CI_COMMIT_AUTHOR:-未设置}"
+echo "  CI_PIPELINE_NUMBER: ${CI_PIPELINE_NUMBER:-未设置}"
+echo "  CI_REPO_ID: ${CI_REPO_ID:-未设置}"
+
+echo ""
+echo "📋 问题3: Woodpecker CI 配置验证"
+echo "----------------------------------------"
+if command -v python3 &> /dev/null; then
+    echo "运行 Python 诊断脚本..."
+    python3 diagnose-woodpecker.py 2>/dev/null || echo "诊断脚本执行失败"
+else
+    echo "⚠️  Python3 未安装，跳过配置验证"
+fi
+
+echo ""
+echo "=========================================="
+echo "诊断完成"
+echo "=========================================="