fix: 修复了一堆API错误，并顺手添加了OSS API

apps/frontend/lib/api/endpoints/oss.client.ts

@@ -0,0 +1,13 @@
+import { clientFetch } from "../client";
+
+export interface StsToken {
+    AccessKeyId: string;
+    AccessKeySecret: string;
+    Expiration: string;// ISO 8601 格式
+    SecurityToken: string;
+    userId: string;
+}
+
+export async function getStsToken() {
+    return clientFetch<StsToken>('/api/oss/sts');
+}