build: 移除Dockerfile中的mailcap依赖并优化前端配置

- 删除Dockerfile中不必要的mailcap包以精简镜像
- 将前端配置从process.env改为import.meta.env以适配现代构建工具
- 移除Go代码中手动设置mime类型的冗余逻辑
- 修复静态资源路由路径格式（/assets改为assets/）
- 优化导入语句格式和代码结构

Dockerfile

@@ -44,7 +44,7 @@ FROM debian:stable-slim
 ENV TZ=Asia/Shanghai
 
 RUN apt-get update \
-    && apt-get install -y ca-certificates tzdata mailcap \
+    && apt-get install -y ca-certificates tzdata \
     && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app

main.go

@@ -11,7 +11,6 @@ import (
 	"message-nest/routers"
 	"message-nest/service/cron_msg_service"
 	"message-nest/service/cron_service"
-	"mime"
 	"net/http"
 	"os"
 
@@ -20,7 +19,7 @@ import (
 )
 
 var (
-	//go:embed all:web/dist
+	//go:embed web/dist/*
 	f embed.FS
 
 	//go:embed .release*
@@ -28,10 +27,6 @@ var (
 )
 
 func init() {
-	// 设置 mime 类型，防止 docker 镜像中缺少 mime 类型导致 js 文件加载失败
-	mime.AddExtensionType(".js", "application/javascript")
-	mime.AddExtensionType(".css", "text/css")
-
 	constant.InitReleaseInfo(rf)
 	setting.Setup()
 	logging.Setup()

routers/router.go

@@ -3,16 +3,17 @@ package routers
 import (
 	"embed"
 	"fmt"
-	"github.com/gin-gonic/gin"
 	"io"
 	"io/fs"
 	"message-nest/middleware"
 	"message-nest/pkg/setting"
 	"message-nest/routers/api"
-	"message-nest/routers/api/v1"
-	"message-nest/routers/api/v2"
+	v1 "message-nest/routers/api/v1"
+	v2 "message-nest/routers/api/v2"
 	"net/http"
 	"strings"
+
+	"github.com/gin-gonic/gin"
 )
 
 // AppendCors 添加是否跨域（debug模式开启）
@@ -73,7 +74,7 @@ func AppendServerStaticHtmlWithPrefix(router gin.IRouter, f embed.FS, pathPrefix
 		// 无路径前缀时，使用原有逻辑
 		if r, ok := router.(*gin.Engine); ok {
 			r.Use(middleware.StaticCacheMiddleware())
-			r.StaticFS("/assets", http.FS(assets))
+			r.StaticFS("assets/", http.FS(assets))
 			r.GET("/", func(ctx *gin.Context) {
 				ctx.FileFromFS("/", http.FS(dist))
 			})

web/config.js

@@ -1,6 +1,6 @@
 // config.js
 
-const isProduction = process.env.NODE_ENV === 'prod' || process.env.NODE_ENV === 'production';
+const isProduction = import.meta.env.PROD;
 
 // 从 window 对象获取路径前缀（由后端注入或通过 API 获取）
 const getPathPrefix = () => {