chore: add cross-platform startup scripts

- start.sh: Linux/macOS一键启动 (编译+后端+前端+健康检查)
- start.bat: Windows批处理 (两个终端窗口)
- Ctrl+C优雅退出，环境变量可覆盖

start.bat

@@ -0,0 +1,36 @@
+@echo off
+setlocal
+cd /d "%~dp0"
+
+set LLM_API_KEY=sk-test
+set JWT_SECRET=cyrene-v2-dev-secret-key-32bytes!!
+set ADMIN_PASSWORD=admin12345
+
+echo ============================================
+echo   Cyrene v2 — Windows 启动脚本
+echo ============================================
+
+echo [1/2] 编译后端...
+cd backend
+go build -o cyrene.exe ./cmd/cyrene/
+if %errorlevel% neq 0 (
+    echo 后端编译失败
+    pause
+    exit /b 1
+)
+
+echo [1/2] 启动后端 (http://localhost:8080)...
+start "Cyrene Backend" cmd /c "set LLM_API_KEY=%LLM_API_KEY% && set JWT_SECRET=%JWT_SECRET% && set ADMIN_PASSWORD=%ADMIN_PASSWORD% && cyrene.exe"
+
+cd ..\frontend\web
+
+echo [2/2] 启动前端 (http://localhost:5173)...
+start "Cyrene Frontend" cmd /c "npx vite --host 0.0.0.0"
+
+echo.
+echo Cyrene v2 启动完成
+echo   前端: http://localhost:5173
+echo   后端: http://localhost:8080
+echo   账号: admin / %ADMIN_PASSWORD%
+echo.
+pause

start.sh

@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+set -e
+cd "$(dirname "$0")"
+
+# ============================================
+# Cyrene v2 — 一键启动脚本
+# ============================================
+
+# 默认环境变量（可通过 .env 或命令行覆盖）
+export LLM_API_KEY="${LLM_API_KEY:-sk-test}"
+export JWT_SECRET="${JWT_SECRET:-cyrene-v2-dev-secret-key-32bytes!!}"
+export ADMIN_PASSWORD="${ADMIN_PASSWORD:-admin12345}"
+
+BACKEND_DIR="./backend"
+FRONTEND_DIR="./frontend/web"
+
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+BLUE='\033[0;34m'
+NC='\033[0m'
+
+log()  { echo -e "${GREEN}[cyrene]${NC} $1"; }
+warn() { echo -e "${RED}[cyrene]${NC} $1"; }
+
+# 清理函数
+cleanup() {
+    log "正在关闭服务..."
+    kill $BACKEND_PID $FRONTEND_PID 2>/dev/null
+    wait $BACKEND_PID $FRONTEND_PID 2>/dev/null
+    log "已退出"
+}
+trap cleanup EXIT INT TERM
+
+# ---------- 后端 ----------
+log "编译后端..."
+cd "$BACKEND_DIR"
+export PATH="/usr/lib/go-1.26/bin:$PATH"
+go build -o cyrene ./cmd/cyrene/ 2>&1 || { warn "后端编译失败"; exit 1; }
+
+log "启动后端 (http://localhost:8080)..."
+./cyrene &
+BACKEND_PID=$!
+sleep 2
+
+# 检查后端健康
+if ! curl -s http://localhost:8080/api/v1/health > /dev/null 2>&1; then
+    warn "后端启动失败，请检查日志"
+    exit 1
+fi
+log "后端启动成功 ✓"
+
+# ---------- 前端 ----------
+cd "$OLDPWD/$FRONTEND_DIR"
+log "安装前端依赖..."
+npm install --registry=https://registry.npmmirror.com --silent 2>/dev/null || true
+
+log "启动前端 (http://localhost:5173)..."
+npx vite --host 0.0.0.0 &
+FRONTEND_PID=$!
+sleep 3
+
+echo ""
+echo -e "${BLUE}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${NC}"
+echo -e "${BLUE}  Cyrene v2 启动完成${NC}"
+echo -e "${BLUE}  前端: http://localhost:5173${NC}"
+echo -e "${BLUE}  后端: http://localhost:8080${NC}"
+echo -e "${BLUE}  账号: admin / ${ADMIN_PASSWORD}${NC}"
+echo -e "${BLUE}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${NC}"
+echo ""
+echo "按 Ctrl+C 停止所有服务"
+
+# 等待任意进程退出
+wait -n $BACKEND_PID $FRONTEND_PID 2>/dev/null