fix: run.sh 改为启动 Go 后端 + dashboard stats 格式对齐前端

- run.sh start_backend 改为编译+运行 Go 二进制
- DashboardStats handler 返回前端期望的字段格式
- build/test 命令适配 Go 工具链
- 前端验证: 登录/仪表盘/工单列表/查询页面正常

run.sh

@@ -74,31 +74,21 @@ start_backend() {
         return
     fi
 
-    log "启动后端..."
+    log "启动后端 (Go/Gin)..."
 
     cd "$SCRIPT_DIR/backend"
-    if [ ! -d "venv" ]; then
-        log "创建 Python 虚拟环境..."
-        python3 -m venv venv
-    fi
-    source venv/bin/activate
 
-    if [ ! -f "venv/lib/python*/site-packages/fastapi/__init__.py" ] 2>/dev/null; then
-        log "安装后端依赖..."
-        pip install -r requirements.txt -q 2>&1 | tail -3
-    fi
+    # 始终重新编译（开发阶段）
+    unset http_proxy https_proxy HTTP_PROXY HTTPS_PROXY
+    go build -o sql-platform ./cmd/server/
 
-    # 数据库迁移
-    venv/bin/alembic upgrade head 2>/dev/null || true
-
-    nohup venv/bin/python -m uvicorn app.main:app \
-        --host 0.0.0.0 --port 9000 --reload \
+    nohup ./sql-platform \
         > "$LOG_DIR/backend.log" 2>&1 &
     echo $! > "$BACKEND_PID_FILE"
 
     # 等待后端就绪
     for i in $(seq 1 15); do
-        if curl -s http://localhost:9000/docs > /dev/null 2>&1; then
+        if curl -s http://localhost:9000/health > /dev/null 2>&1; then
             ok "后端已启动 → http://localhost:9000 (PID: $(cat $BACKEND_PID_FILE))"
             return
         fi
@@ -155,7 +145,8 @@ show_status() {
 
     echo ""
     echo "  API 文档: http://localhost:9000/docs"
-    echo "  默认账号: admin / 123456"
+    echo "  后端引擎: Go/Gin v0.3.1"
+    echo "  默认账号: admin / admin123"
     echo "  日志目录: $LOG_DIR/"
     echo ""
 }
@@ -207,10 +198,11 @@ case "${1:-start}" in
 
     build)
         log "=== 构建生产版本 ==="
-        cd "$SCRIPT_DIR/backend" && source venv/bin/activate
-        log "构建后端..."
-        pip install -r requirements.txt -q
-        ok "后端依赖已安装"
+        cd "$SCRIPT_DIR/backend"
+        log "编译 Go 后端..."
+        unset http_proxy https_proxy HTTP_PROXY HTTPS_PROXY
+        go build -o sql-platform ./cmd/server/
+        ok "后端编译完成 → backend/sql-platform"
 
         cd "$SCRIPT_DIR/frontend"
         log "构建前端..."
@@ -220,8 +212,9 @@ case "${1:-start}" in
 
     test|t)
         log "=== 运行测试 ==="
-        cd "$SCRIPT_DIR/backend" && source venv/bin/activate
-        python -m pytest tests/ -v --tb=short "$@"
+        cd "$SCRIPT_DIR/backend"
+        unset http_proxy https_proxy HTTP_PROXY HTTPS_PROXY
+        go test ./... -v "$@"
         ;;
 
     *)