refactor(main): 重构主应用结构以提高模块化

- 将main.go中的初始化逻辑提取到新的app包中
- 创建bootstrap包来处理配置加载和数据库初始化
- 添加middleware包来管理CORS中间件
- 创建router包来处理路由配置
- 简化main函数，只保留应用启动逻辑
- 使用依赖注入模式组织服务和处理器

memora-api/internal/app/app.go

@@ -0,0 +1,50 @@
+package app
+
+import (
+	"fmt"
+
+	"memora-api/internal/bootstrap"
+	"memora-api/internal/handler"
+	"memora-api/internal/router"
+	"memora-api/internal/service"
+
+	"github.com/gin-gonic/gin"
+)
+
+type App struct {
+	engine *gin.Engine
+	addr   string
+}
+
+func New(configPath string) (*App, error) {
+	cfg, err := bootstrap.LoadConfig(configPath)
+	if err != nil {
+		return nil, fmt.Errorf("加载配置失败: %w", err)
+	}
+
+	db, err := bootstrap.InitDB(cfg)
+	if err != nil {
+		return nil, fmt.Errorf("连接数据库失败: %w", err)
+	}
+
+	if err := bootstrap.AutoMigrate(db); err != nil {
+		return nil, fmt.Errorf("数据库迁移失败: %w", err)
+	}
+
+	wordService := service.NewWordService(db)
+	wordHandler := handler.NewWordHandler(wordService)
+	engine := router.New(wordHandler)
+
+	return &App{
+		engine: engine,
+		addr:   fmt.Sprintf("%s:%d", cfg.Server.Host, cfg.Server.Port),
+	}, nil
+}
+
+func (a *App) Run() error {
+	return a.engine.Run(a.addr)
+}
+
+func (a *App) Addr() string {
+	return a.addr
+}

memora-api/internal/bootstrap/config.go

@@ -0,0 +1,7 @@
+package bootstrap
+
+import "memora-api/internal/config"
+
+func LoadConfig(path string) (*config.Config, error) {
+	return config.LoadConfig(path)
+}

memora-api/internal/bootstrap/database.go

@@ -0,0 +1,17 @@
+package bootstrap
+
+import (
+	"memora-api/internal/config"
+	"memora-api/internal/model"
+
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
+)
+
+func InitDB(cfg *config.Config) (*gorm.DB, error) {
+	return gorm.Open(mysql.Open(cfg.Database.DSN()), &gorm.Config{})
+}
+
+func AutoMigrate(db *gorm.DB) error {
+	return db.AutoMigrate(&model.Word{}, &model.MemoryRecord{})
+}

memora-api/internal/middleware/cors.go

@@ -0,0 +1,17 @@
+package middleware
+
+import "github.com/gin-gonic/gin"
+
+func CORS() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
+		c.Writer.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
+		c.Writer.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")
+
+		if c.Request.Method == "OPTIONS" {
+			c.AbortWithStatus(204)
+			return
+		}
+		c.Next()
+	}
+}

memora-api/internal/router/router.go

@@ -0,0 +1,25 @@
+package router
+
+import (
+	"memora-api/internal/handler"
+	"memora-api/internal/middleware"
+
+	"github.com/gin-gonic/gin"
+)
+
+func New(wordHandler *handler.WordHandler) *gin.Engine {
+	r := gin.Default()
+	r.Use(middleware.CORS())
+
+	api := r.Group("/api")
+	{
+		api.POST("/words", wordHandler.AddWord)
+		api.GET("/words", wordHandler.GetWords)
+		api.GET("/review", wordHandler.GetReviewWords)
+		api.POST("/review", wordHandler.SubmitReview)
+		api.GET("/stats", wordHandler.GetStatistics)
+		api.GET("/audio", wordHandler.GetAudio)
+	}
+
+	return r
+}