chore: 移除 npm 镜像配置，使用默认 registry

Author: RealHeart

.github/workflows/build.yml

@@ -6,9 +6,6 @@ on:
       - main
   workflow_dispatch:
 
-env:
-  COREPACK_NPM_REGISTRY: https://registry.npmmirror.com
-
 jobs:
   build-and-deploy:
     runs-on: ubuntu-latest
@@ -28,7 +25,7 @@ jobs:
           cache: pnpm
 
       - name: Install Dependencies
-        run: pnpm install --frozen-lockfile --registry $COREPACK_NPM_REGISTRY
+        run: pnpm install --frozen-lockfile
 
       - name: Build Project
         run: pnpm build