feat(upload): enhance upload functionality with chunk management and cancellation support

- Updated Upload.vue to include cancelItem functionality in the upload queue.
- Modified UploadQueue.vue to emit cancel events for individual items.
- Enhanced UploadQueueItem.vue to display cancel button for ongoing uploads.
- Added merge.ts for handling manifest creation and S3 operations for chunk uploads.
- Introduced temp.html for testing multi-threaded chunk uploads with progress tracking.
- Created AGENTS.md for comprehensive project documentation and guidelines.

src/api/httpClientAdapter.server.ts

@@ -1,5 +1,5 @@
 import { tryGetContext } from "hono/context-storage";
-
+export const baseAPIURL = "https://api.pipic.fun";
 export const customFetch = (url: string, options: RequestInit) => {
   options.credentials = "include";
   const c = tryGetContext<any>();
@@ -21,7 +21,7 @@ export const customFetch = (url: string, options: RequestInit) => {
     ...(options.headers as Record<string, string>),
   };
 
-  const apiUrl = ["https://api.pipic.fun", url.replace(/^r/, "")].join("");
+  const apiUrl = [baseAPIURL, url.replace(/^r/, "")].join("");
   return fetch(apiUrl, options).then(async (res) => {
 	res.headers.getSetCookie()?.forEach((cookie) => {
 		  c.header("Set-Cookie", cookie);