fix(bugcollect): HttpInterceptor 用 globalThis 替代 global，修复消费端 TS 找不到 global

BugCollect.startCapture 自动启用 HttpInterceptor 后，该文件进入消费端类型检查图；
部分 RN 工程 tsconfig 未提供 `global` 类型，改用 globalThis（可移植）。

Co-Authored-By: Claude <noreply@anthropic.com>

packages/bugcollect/src/interceptor/HttpInterceptor.ts

@@ -14,10 +14,10 @@ export const HttpInterceptor = {
   start(onError: OnError): void {
     if (_originalFetch) return  // already installed
 
-    _originalFetch = global.fetch
+    _originalFetch = globalThis.fetch
 
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    ;(global as any).fetch = async (
+    ;(globalThis as any).fetch = async (
       input: RequestInfo | URL,
       init?: RequestInit,
     ): Promise<Response> => {
@@ -44,7 +44,7 @@ export const HttpInterceptor = {
   stop(): void {
     if (_originalFetch) {
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      ;(global as any).fetch = _originalFetch
+      ;(globalThis as any).fetch = _originalFetch
       _originalFetch = null
     }
   },