refactor(app): 将应用逻辑抽取到 internal/app 包

将版本信息和核心运行逻辑从 main.go 移至 internal/app/app.go，
main.go 仅保留 CLI 参数解析和入口调用。

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

Makefile

@@ -12,12 +12,12 @@ BUILD_DIR := bin
 
 # 生产构建标志
 LDFLAGS := -ldflags "-s -w \
-	-X 'main.version=$(VERSION)' \
-	-X 'main.gitCommit=$(GIT_COMMIT)' \
-	-X 'main.gitBranch=$(GIT_BRANCH)' \
-	-X 'main.buildTime=$(BUILD_TIME)' \
-	-X 'main.goVersion=$(GO_VERSION)' \
-	-X 'main.buildPlatform=$(BUILD_PLATFORM)'"
+	-X 'rua.plus/lolly/internal/app.Version=$(VERSION)' \
+	-X 'rua.plus/lolly/internal/app.GitCommit=$(GIT_COMMIT)' \
+	-X 'rua.plus/lolly/internal/app.GitBranch=$(GIT_BRANCH)' \
+	-X 'rua.plus/lolly/internal/app.BuildTime=$(BUILD_TIME)' \
+	-X 'rua.plus/lolly/internal/app.GoVersion=$(GO_VERSION)' \
+	-X 'rua.plus/lolly/internal/app.BuildPlatform=$(BUILD_PLATFORM)'"
 
 # Go 文件
 MAIN_PATH := main.go

internal/app/app.go

@@ -0,0 +1,79 @@
+// Package app 提供应用程序的启动和运行逻辑。
+package app
+
+import (
+	"fmt"
+	"os"
+
+	"rua.plus/lolly/internal/config"
+)
+
+// 版本信息，通过 -ldflags 注入。
+var (
+	Version       = "dev"
+	GitCommit     = "unknown"
+	GitBranch     = "unknown"
+	BuildTime     = "unknown"
+	GoVersion     = "unknown"
+	BuildPlatform = "unknown"
+)
+
+// Run 应用程序入口。
+func Run(cfgPath string, genConfig bool, outputPath string, showVersion bool) int {
+	if genConfig {
+		return generateConfig(outputPath)
+	}
+
+	if showVersion {
+		printVersion()
+		return 0
+	}
+
+	return startServer(cfgPath)
+}
+
+// generateConfig 生成默认配置文件。
+func generateConfig(outputPath string) int {
+	cfg := config.DefaultConfig()
+	yamlData, err := config.GenerateConfigYAML(cfg)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "生成配置失败: %v\n", err)
+		return 1
+	}
+
+	if outputPath == "" {
+		fmt.Print(string(yamlData))
+	} else {
+		if err := os.WriteFile(outputPath, yamlData, 0644); err != nil {
+			fmt.Fprintf(os.Stderr, "写入文件失败: %v\n", err)
+			return 1
+		}
+		fmt.Printf("配置已写入: %s\n", outputPath)
+	}
+	return 0
+}
+
+// printVersion 打印版本信息。
+func printVersion() {
+	fmt.Printf("lolly version %s\n", Version)
+	fmt.Printf("  Git: %s (%s)\n", GitCommit, GitBranch)
+	fmt.Printf("  Built: %s\n", BuildTime)
+	fmt.Printf("  Go: %s\n", GoVersion)
+	fmt.Printf("  Platform: %s\n", BuildPlatform)
+}
+
+// startServer 启动服务器。
+func startServer(cfgPath string) int {
+	cfg, err := config.Load(cfgPath)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "加载配置失败: %v\n", err)
+		return 1
+	}
+
+	fmt.Printf("配置加载成功: %s\n", cfgPath)
+	fmt.Printf("监听地址: %s\n", cfg.Server.Listen)
+
+	// TODO: 启动服务器
+	fmt.Println("服务器启动中...")
+	return 0
+}

main.go

@@ -2,89 +2,25 @@ package main
 
 import (
 	"flag"
-	"fmt"
 	"os"
 
-	"rua.plus/lolly/internal/config"
-)
-
-// 通过 -ldflags 注入的版本信息
-var (
-	version       = "dev"
-	gitCommit     = "unknown"
-	gitBranch     = "unknown"
-	buildTime     = "unknown"
-	goVersion     = "unknown"
-	buildPlatform = "unknown"
-)
-
-// CLI 参数
-var (
-	cfgPath     = flag.String("c", "lolly.yaml", "配置文件路径")
-	cfgPathLong = flag.String("config", "", "配置文件路径（长参数）")
-	genConfig   = flag.Bool("generate-config", false, "生成默认配置")
-	outputPath  = flag.String("o", "", "输出文件路径（配合 --generate-config）")
-	showVersion = flag.Bool("v", false, "显示版本")
+	"rua.plus/lolly/internal/app"
 )
 
 func main() {
+	cfgPath := flag.String("c", "lolly.yaml", "配置文件路径")
+	cfgPathLong := flag.String("config", "", "配置文件路径（长参数）")
+	genConfig := flag.Bool("generate-config", false, "生成默认配置")
+	outputPath := flag.String("o", "", "输出文件路径（配合 --generate-config）")
+	showVersion := flag.Bool("v", false, "显示版本")
+
 	flag.Parse()
 
-	// --generate-config 优先处理
-	if *genConfig {
-		handleGenerateConfig(*outputPath)
-		return
-	}
-
-	// 版本显示
-	if *showVersion {
-		printVersion()
-		return
-	}
-
 	// 合并短参数和长参数
 	configPath := *cfgPath
 	if *cfgPathLong != "" {
 		configPath = *cfgPathLong
 	}
 
-	// 加载配置
-	cfg, err := config.Load(configPath)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "加载配置失败: %v\n", err)
-		os.Exit(1)
-	}
-
-	fmt.Printf("配置加载成功: %s\n", configPath)
-	fmt.Printf("监听地址: %s\n", cfg.Server.Listen)
-
-	// TODO: 启动服务器
-	fmt.Println("服务器启动中...")
-}
-
-func handleGenerateConfig(outputPath string) {
-	cfg := config.DefaultConfig()
-	yamlData, err := config.GenerateConfigYAML(cfg)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "生成配置失败: %v\n", err)
-		os.Exit(1)
-	}
-
-	if outputPath == "" {
-		fmt.Print(string(yamlData))
-	} else {
-		if err := os.WriteFile(outputPath, yamlData, 0644); err != nil {
-			fmt.Fprintf(os.Stderr, "写入文件失败: %v\n", err)
-			os.Exit(1)
-		}
-		fmt.Printf("配置已写入: %s\n", outputPath)
-	}
-}
-
-func printVersion() {
-	fmt.Printf("lolly version %s\n", version)
-	fmt.Printf("  Git: %s (%s)\n", gitCommit, gitBranch)
-	fmt.Printf("  Built: %s\n", buildTime)
-	fmt.Printf("  Go: %s\n", goVersion)
-	fmt.Printf("  Platform: %s\n", buildPlatform)
+	os.Exit(app.Run(configPath, *genConfig, *outputPath, *showVersion))
 }