chore: embed health.html 到 binary,单文件分发

把 health.html 从外部依赖改为 //go:embed 内嵌,
实现真正的"单 exe 分发"。

  - 新建 router/dashboard.go,用 //go:embed 嵌入 health.html
  - router/router.go:/dashboard handler 改为 w.Write(dashboardHTML)
  - setting/config.go:删 CheckStaticFiles(无需文件检查)
  - main.go:删 setting.CheckStaticFiles() 调用
  - Dockerfile:删 COPY health.html 步骤(已嵌入)
  - .gitignore:加 release/(build 产物不入 git)
  - 物理移动 health.html 到 router/(embed 限制:同包或子包)

效果:
  - 之前: release 包 = tts-api.exe + health.html (2 个文件)
  - 之后: release 包 = tts-api.exe (1 个文件,~7 MB)
  - 用户部署无需额外文件,/dashboard 路由直接工作

.gitignore

@@ -20,3 +20,6 @@ Thumbs.db
 
 # Local-only working notes (use task board for shared tracking)
 TODO.md
+
+# Release artifacts (build output)
+release/

Dockerfile

@@ -25,7 +25,7 @@ RUN apk --no-cache add ca-certificates tzdata \
 WORKDIR /app
 
 COPY --from=builder /app/tts-api .
-COPY --from=builder /app/health.html .
+# health.html 已通过 //go:embed 嵌入 binary,无需单独复制
 
 RUN chown -R appuser:appgroup /app
 

main.go

@@ -23,7 +23,6 @@ func main() {
 	setting.InitAllConfigs()
 	metrics.Init()
 	middleware.InitRateLimiter()
-	setting.CheckStaticFiles()
 	controller.InitController()
 	setting.LogStartupSummary()
 

router/dashboard.go

@@ -0,0 +1,6 @@
+package router
+
+import _ "embed"
+
+//go:embed health.html
+var dashboardHTML []byte

router/router.go

@@ -20,7 +20,8 @@ func Setup() *mux.Router {
 	r.HandleFunc("/v1/audio/speech", controller.OpenaiTTSHandler).Methods("POST", "OPTIONS")
 	r.HandleFunc("/health", controller.HealthHandler).Methods("GET")
 	r.HandleFunc("/dashboard", func(w http.ResponseWriter, r *http.Request) {
-		http.ServeFile(w, r, "health.html")
+		w.Header().Set("Content-Type", "text/html; charset=utf-8")
+		w.Write(dashboardHTML)
 	}).Methods("GET")
 	r.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 		http.Redirect(w, r, "/dashboard", http.StatusFound)

setting/config.go

@@ -309,10 +309,3 @@ func maskAPIKey(key string) string {
 	}
 	return key[:4] + "****" + key[len(key)-4:]
 }
-
-// CheckStaticFiles 检查 /dashboard 路由依赖的 health.html 是否存在。
-func CheckStaticFiles() {
-	if _, err := os.Stat("health.html"); os.IsNotExist(err) {
-		log.Println("警告: health.html 不存在,/dashboard 路由将返回 404")
-	}
-}