chore(mp): 添加开发启动脚本（缓存清理+编译）

apps/miniprogram/dev.ps1

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+# HMS 小程序开发启动脚本
+# 用法：右键 → 使用 PowerShell 运行，或在终端中 ./dev.ps1
+
+Write-Host "=== HMS 小程序开发环境 ===" -ForegroundColor Cyan
+
+# 1. 提升文件描述符限制
+Write-Host "[1/3] 设置文件描述符限制..." -ForegroundColor Yellow
+try {
+    $current = (Get-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\SubSystems" -Name "Windows" -ErrorAction Stop).Windows
+    Write-Host "  系统文件描述符配置已读取" -ForegroundColor Green
+} catch {
+    Write-Host "  无法读取系统配置（需要管理员权限）" -ForegroundColor Red
+}
+
+# 2. 清理缓存
+Write-Host "[2/3] 清理构建缓存..." -ForegroundColor Yellow
+if (Test-Path "dist") {
+    Remove-Item -Recurse -Force dist -ErrorAction SilentlyContinue
+    Write-Host "  dist 已清理" -ForegroundColor Green
+}
+if (Test-Path "node_modules\.cache") {
+    Remove-Item -Recurse -Force node_modules\.cache -ErrorAction SilentlyContinue
+    Write-Host "  webpack cache 已清理" -ForegroundColor Green
+}
+
+# 3. 启动开发编译
+Write-Host "[3/3] 启动 Taro 开发编译..." -ForegroundColor Yellow
+Write-Host ""
+$env:NODE_ENV = "development"
+npx taro build --type weapp --watch
+
+Write-Host ""
+Write-Host "提示：" -ForegroundColor Cyan
+Write-Host "  - 编译完成后在微信开发者工具中导入 dist 目录"
+Write-Host "  - 如遇到 EMFILE 错误，请重启此脚本"
+Write-Host "  - 建议每 2 小时重启微信开发者工具防止内存泄漏"