release(main): 集成 nginx 移除里程碑

frontend/src/api/baseUrl.ts

@@ -0,0 +1,12 @@
+const trimTrailingSlashes = (value: string): string => value.replace(/\/+$/, "");
+
+export const resolveApiBaseUrl = (rawValue: string | undefined): string => {
+  const normalized = rawValue?.trim() ?? "";
+  if (!normalized) {
+    return "/";
+  }
+  if (normalized === "/") {
+    return "/";
+  }
+  return trimTrailingSlashes(normalized);
+};