Phase 0+1+2 续: 项目骨架 + 配置 + 日志 + 存储层

Phase 0 (项目骨架):
- main.go 改为最小骨架 (config + logging + gin + /healthz + 优雅退出)
- internal/{config,logging,storage,cluster,...}/ 目录占位

Phase 1 (配置 + 日志):
- internal/config: env 解析 + 必填校验 + token 隐藏的 String()
- internal/logging: slog multi-handler 双输出 (终端 text + 主文件 JSON)
  + StartToolCall per-tool 独立文件 (0600), tools 目录 0700

Phase 2 续 (存储层):
- internal/cluster: 16 字段 Cluster struct (AuthPassword json:"-")
- internal/storage: modernc.org/sqlite 接入, WAL 模式, schema 自动迁移
- ClusterRepo CRUD: Create/Get/List/Update/Delete + ErrNotFound
  + AuthPassword 空字符串 = 保留旧密码 (核心约定)
- 7 个单元测试全绿 (:memory: DB)
- created_at/updated_at 改纳秒精度, 消除 List 测试的 sleep 特殊 case

Co-Authored-By: Claude <noreply@anthropic.com>

main.go

@@ -1,20 +1,88 @@
+// Command spark-mcp-go launches the Spark MCP Server.
+//
+// Phase 0 scope: wire config + slog + Gin + /healthz.
+// Full MCP transport, admin API, and Tool surface land in later phases.
 package main
 
 import (
-	"fmt"
+	"context"
+	"errors"
+	"log/slog"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/gin-gonic/gin"
+
+	"spark-mcp-go/internal/config"
+	"spark-mcp-go/internal/logging"
 )
 
-// TIP <p>To run your code, right-click the code and select <b>Run</b>.</p> <p>Alternatively, click
-// the <icon src="AllIcons.Actions.Execute"/> icon in the gutter and select the <b>Run</b> menu item from here.</p>
 func main() {
-	//TIP <p>Press <shortcut actionId="ShowIntentionActions"/> when your caret is at the underlined text
-	// to see how GoLand suggests fixing the warning.</p><p>Alternatively, if available, click the lightbulb to view possible fixes.</p>
-	s := "gopher"
-	fmt.Println("Hello and welcome, %s!", s)
-
-	for i := 1; i <= 5; i++ {
-		//TIP <p>To start your debugging session, right-click your code in the editor and select the Debug option.</p> <p>We have set one <icon src="AllIcons.Debugger.Db_set_breakpoint"/> breakpoint
-		// for you, but you can always add more by pressing <shortcut actionId="ToggleLineBreakpoint"/>.</p>
-		fmt.Println("i =", 100/i)
+	if err := run(); err != nil {
+		// run() handles its own logging; this is the last-chance report.
+		slog.Error("fatal", "err", err)
+		os.Exit(1)
 	}
 }
+
+func run() error {
+	cfg, err := config.Load()
+	if err != nil {
+		return err
+	}
+
+	logger, shutdownLog, err := logging.New(logging.Config{
+		Level:    cfg.LogLevel,
+		Dir:      cfg.LogDir,
+		Format:   cfg.LogFormat,
+		LogToStd: true,
+	})
+	if err != nil {
+		return err
+	}
+	defer shutdownLog()
+	slog.SetDefault(logger)
+
+	if err := os.MkdirAll(cfg.LogDir+"/tools", 0o700); err != nil {
+		return err
+	}
+
+	gin.SetMode(gin.ReleaseMode)
+	r := gin.New()
+	r.Use(gin.Recovery())
+
+	r.GET("/healthz", func(c *gin.Context) {
+		c.JSON(http.StatusOK, gin.H{"ok": true, "version": "0.0.0"})
+	})
+
+	srv := &http.Server{
+		Addr:              cfg.ListenAddr,
+		Handler:           r,
+		ReadHeaderTimeout: 10 * time.Second,
+	}
+
+	errCh := make(chan error, 1)
+	go func() {
+		logger.Info("server.start", "addr", cfg.ListenAddr, "data_dir", cfg.DataDir)
+		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			errCh <- err
+		}
+	}()
+
+	stop := make(chan os.Signal, 1)
+	signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
+
+	select {
+	case err := <-errCh:
+		return err
+	case sig := <-stop:
+		logger.Info("server.shutdown", "signal", sig.String())
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	return srv.Shutdown(ctx)
+}