fix(api): 移除对只读数据库的ALTER TABLE操作

由于数据库是只读的，移除ExportsAPI中尝试修改表结构的ensureOwnerColumn方法调用
同时从Dockerfile中移除APP_ENV=prod的环境变量设置

Dockerfile

@@ -13,6 +13,5 @@ COPY --from=build /app/web /app/web
 COPY --from=build /app/server/config.test.yaml /app/server/config.test.yaml
 COPY --from=build /app/server/config.prod.yaml /app/server/config.prod.yaml
 RUN mkdir -p /app/storage/export
-ENV APP_ENV=prod
 EXPOSE 8077
 ENTRYPOINT ["/app/bin/marketing-data-server"]

server/cmd/server/main.go

@@ -5,7 +5,6 @@ import (
     "marketing-system-data-tool/server/internal/api"
     "marketing-system-data-tool/server/internal/config"
     "marketing-system-data-tool/server/internal/db"
-    "marketing-system-data-tool/server/internal/migrate"
     "marketing-system-data-tool/server/internal/logging"
     "net/http"
     "time"
@@ -14,6 +13,7 @@ import (
 
 func main() {
     cfg := config.Load()
+    log.Println("APP_ENV:", os.Getenv("APP_ENV"))
     if cfg.YMTKeyDecryptKeyB64 != "" { os.Setenv("YMT_KEY_DECRYPT_KEY_B64", cfg.YMTKeyDecryptKeyB64) }
     _ = logging.Init("log")
     log.Println("connecting YMT MySQL:", cfg.YMTDB.Host+":"+cfg.YMTDB.Port, "db", cfg.YMTDB.Name, "user", cfg.YMTDB.User)
@@ -32,13 +32,7 @@ func main() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	if cfg.YMTDB.DSN() != "" {
-		if err := migrate.Apply(ymt); err != nil {
-			log.Fatal(err)
-		}
-	} else {
-		log.Println("skip migrations: YMT DSN missing")
-	}
+    _ = ymt
     r := api.NewRouter(ymt, marketing)
 	addr := ":" + func() string {
 		s := cfg.Port

server/internal/api/exports.go

@@ -61,10 +61,8 @@ func ExportsHandler(meta, marketing *sql.DB) http.Handler {
 	})
 }
 
-func (a *ExportsAPI) ensureOwnerColumn() {
-	// Try to add owner_id column if not exists; ignore errors
-	_, _ = a.meta.Exec("ALTER TABLE export_jobs ADD COLUMN owner_id BIGINT UNSIGNED NOT NULL DEFAULT 0")
-}
+// owner_id 列在只读库不做运行时变更，避免 ALTER TABLE 触发错误
+func (a *ExportsAPI) ensureOwnerColumn() {}
 
 type ExportPayload struct {
 	TemplateID  uint64                 `json:"template_id"`
@@ -947,7 +945,6 @@ func toString(v interface{}) string {
 	}
 }
 func (a *ExportsAPI) list(w http.ResponseWriter, r *http.Request) {
-	a.ensureOwnerColumn()
 	q := r.URL.Query()
 	page := 1
 	size := 15