feat(launcher): pipeline backend double-click launcher

- start-backend-pipeline.cmd: double-click entry point
- start-backend-pipeline.ps1: venv auto-detect, dep check (fastapi/uvicorn/psutil),
  auto pip install if missing, Chinese port occupancy prompt with PID/process info,
  user confirmation required before killing existing process

start-backend-pipeline.cmd

@@ -0,0 +1,5 @@
+@echo off
+chcp 65001 >nul
+cd /d "%~dp0"
+powershell -NoProfile -ExecutionPolicy Bypass -File "%~dp0start-backend-pipeline.ps1"
+pause

start-backend-pipeline.ps1

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+# GLM Coding Helper - Pipeline Backend Launcher
+# Usage: powershell -File start-backend-pipeline.ps1
+#   or double-click start-backend-pipeline.cmd
+
+$ErrorActionPreference = "Continue"
+$Root = Split-Path -Parent $MyInvocation.MyCommand.Path
+Set-Location $Root
+
+Write-Host "GLM Coding Helper - Pipeline Backend" -ForegroundColor Cyan
+Write-Host ""
+
+# ── 查找 Python venv ──
+$Python = ""
+if (Test-Path "$Root\venv\Scripts\python.exe") {
+    $Python = "$Root\venv\Scripts\python.exe"
+} elseif (Test-Path "$Root\.venv_paddle\Scripts\python.exe") {
+    $Python = "$Root\.venv_paddle\Scripts\python.exe"
+} else {
+    Write-Host "[失败] 未找到 Python 虚拟环境，请先运行安装脚本。" -ForegroundColor Red
+    Write-Host "[FAIL] No Python venv found. Run setup first (one-click-start.cmd / install-env.cmd)." -ForegroundColor Red
+    Read-Host "按 Enter 退出"
+    exit 1
+}
+
+Write-Host "[信息] 使用 Python: $Python" -ForegroundColor Gray
+
+# ── 依赖检查 ──
+$depsCheck = & $Python -c "import fastapi, uvicorn, psutil" 2>&1
+if ($LASTEXITCODE -ne 0) {
+    Write-Host ""
+    Write-Host "[警告] 当前后端环境缺少 pipeline 依赖 (fastapi/uvicorn/psutil)。" -ForegroundColor Yellow
+    Write-Host "[WARN] Missing pipeline backend dependencies. Environment needs repair." -ForegroundColor Yellow
+    Write-Host ""
+
+    # 尝试自动调用 setup_backend.ps1
+    $setupScript = "$Root\scripts\setup_backend.ps1"
+    if (Test-Path $setupScript) {
+        Write-Host "是否自动安装缺失的依赖？"
+        Write-Host "Install missing dependencies automatically?"
+        $choice = Read-Host "输入 1 自动安装 / Enter 退出 (1=install / Enter=exit)"
+        if ($choice -eq "1") {
+            Write-Host "[信息] 正在安装 pipeline 依赖..." -ForegroundColor Cyan
+            $env:PYTHONUTF8 = "1"
+            $env:PYTHONIOENCODING = "utf-8"
+            # 直接 pip install 到当前 venv
+            & $Python -m pip install fastapi "uvicorn[standard]" psutil --quiet
+            if ($LASTEXITCODE -ne 0) {
+                Write-Host "[失败] 自动安装失败，请手动运行: install-env.cmd" -ForegroundColor Red
+                Write-Host "[FAIL] Auto-install failed. Run manually: install-env.cmd" -ForegroundColor Red
+                Read-Host "按 Enter 退出"
+                exit 1
+            }
+            Write-Host "[完成] 依赖安装成功" -ForegroundColor Green
+        } else {
+            Write-Host "请手动运行 install-env.cmd 或 pip install fastapi uvicorn psutil 后重试。" -ForegroundColor Yellow
+            Read-Host "按 Enter 退出"
+            exit 1
+        }
+    } else {
+        Write-Host "请手动运行: $Python -m pip install fastapi uvicorn psutil" -ForegroundColor Yellow
+        Read-Host "按 Enter 退出"
+        exit 1
+    }
+}
+
+# ── 端口检查 ──
+$portLines = netstat -ano | Select-String ":8888 .*LISTENING"
+if ($portLines) {
+    $line = $portLines[0].ToString().Trim()
+    $parts = $line -split '\s+'
+    $portPid = $parts[-1]
+
+    # 获取进程信息
+    $procName = ""
+    $procCmd = ""
+    try {
+        $proc = Get-Process -Id $portPid -ErrorAction SilentlyContinue
+        if ($proc) { $procName = $proc.ProcessName }
+        $procCmd = (Get-CimInstance Win32_Process -Filter "ProcessId=$portPid" -ErrorAction SilentlyContinue).CommandLine
+        if (-not $procCmd) { $procCmd = "" }
+    } catch {}
+
+    Write-Host ""
+    Write-Host "[警告] 端口 8888 已被占用，后端可能已经在运行。" -ForegroundColor Yellow
+    Write-Host "[WARN] Port 8888 is already in use. The backend may already be running." -ForegroundColor Yellow
+    Write-Host ""
+    Write-Host "占用进程:" -ForegroundColor DarkYellow
+    Write-Host "  PID      : $portPid"
+    if ($procName) { Write-Host "  进程名   : $procName" }
+    if ($procCmd) { Write-Host "  命令行   : $procCmd" }
+    Write-Host ""
+    Write-Host "请选择:"
+    Write-Host "  1 - 关闭该进程并重新启动后端"
+    Write-Host "  Enter - 不处理，直接退出"
+    Write-Host ""
+    Write-Host "Choose:"
+    Write-Host "  1 - Stop this process and restart backend"
+    Write-Host "  Enter - Exit without changing anything"
+    Write-Host ""
+
+    $choice = Read-Host "输入 (Input)"
+    if ($choice -eq "1") {
+        Write-Host "[信息] 正在关闭 PID $portPid ..." -ForegroundColor Cyan
+        Stop-Process -Id $portPid -Force -ErrorAction SilentlyContinue
+        Start-Sleep 3
+        Write-Host "[完成] 已关闭。" -ForegroundColor Green
+    } else {
+        exit 1
+    }
+}
+
+Write-Host "[信息] 正在启动 pipeline 后端 http://127.0.0.1:8888" -ForegroundColor Green
+Write-Host "[提示] 首次启动需要加载模型 (~10秒)，请等待 worker 就绪。" -ForegroundColor DarkYellow
+Write-Host "[信息] Ctrl+C 停止" -ForegroundColor Gray
+Write-Host ""
+
+$env:PYTHONUTF8 = "1"
+$env:PYTHONIOENCODING = "utf-8"
+
+& $Python "$Root\backend\server.py"
+
+Read-Host "按 Enter 退出"