chore(config): 新增 WebRTC 信令地址环境变量，放宽 pnpm 版本约束并移除 overrides

pnpm-workspace.yaml

@@ -0,0 +1,17 @@
+verifyDepsBeforeRun: false
+
+allowBuilds:
+  '@parcel/watcher': false
+  core-js-pure: false
+  es5-ext: false
+
+overrides:
+  follow-redirects: ^1.16.2
+  source-map-js: ^1.2.2
+  brace-expansion@1: ^1.1.21
+  brace-expansion@2: ^2.1.7
+  brace-expansion@5: ^5.0.12
+  vite: ~8.2.4
+  fast-uri@3: ^3.1.8
+  '@modelcontextprotocol/server@2': ~2.3.0
+  glob@10: ^10.5.0