feat: 添加应用骨架，配置化 zap 日志贯穿全链路

- cmd/server/main.go: 使用 logger.NewLogger(cfg.Log) 替代 zap.NewProduction()

- internal/app: 依赖注入组装 DB/Slurm/Service/Handler，传递 logger

- internal/middleware: RequestLogger 请求日志中间件

- internal/server: 统一响应格式和路由注册

- go.mod: module 更名为 gcy_hpc_server，添加 gin/zap/lumberjack/gorm 依赖

- 日志初始化失败时 fail fast (os.Exit(1))

- GormLevel 从配置传递到 NewGormDB，支持 YAML 独立配置

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

internal/server/response.go

@@ -0,0 +1,44 @@
+package server
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+)
+
+// APIResponse represents the unified JSON structure for all API responses.
+type APIResponse struct {
+	Success bool        `json:"success"`
+	Data    interface{} `json:"data,omitempty"`
+	Error   string      `json:"error,omitempty"`
+}
+
+// OK responds with 200 and success data.
+func OK(c *gin.Context, data interface{}) {
+	c.JSON(http.StatusOK, APIResponse{Success: true, Data: data})
+}
+
+// Created responds with 201 and success data.
+func Created(c *gin.Context, data interface{}) {
+	c.JSON(http.StatusCreated, APIResponse{Success: true, Data: data})
+}
+
+// BadRequest responds with 400 and an error message.
+func BadRequest(c *gin.Context, msg string) {
+	c.JSON(http.StatusBadRequest, APIResponse{Success: false, Error: msg})
+}
+
+// NotFound responds with 404 and an error message.
+func NotFound(c *gin.Context, msg string) {
+	c.JSON(http.StatusNotFound, APIResponse{Success: false, Error: msg})
+}
+
+// InternalError responds with 500 and an error message.
+func InternalError(c *gin.Context, msg string) {
+	c.JSON(http.StatusInternalServerError, APIResponse{Success: false, Error: msg})
+}
+
+// ErrorWithStatus responds with a custom status code and an error message.
+func ErrorWithStatus(c *gin.Context, code int, msg string) {
+	c.JSON(code, APIResponse{Success: false, Error: msg})
+}