fix(config): externalize ws for copilot-m365-web executor (#6098, closes #6062)

Externalize ws / bufferutil / utf-8-validate in serverExternalPackages so the copilot-m365-web WebSocket masking path works at runtime (bundling ws → TypeError: b.mask is not a function → 80s chat timeout). Regression guard in next-config.test.ts.

Co-authored-by: diegosouzapw <diegosouza.pw@gmail.com>

pnpm-workspace.yaml

@@ -0,0 +1,31 @@
+packages:
+  - "open-sse"
+allowBuilds:
+  "@parcel/watcher": true
+  "@swc/core": true
+  better-sqlite3: true
+  core-js: true
+  esbuild: true
+  keytar: true
+  koffi: true
+  libxmljs2: true
+  onnxruntime-node: true
+  protobufjs: true
+  sharp: true
+  tls-client-node: true
+  unrs-resolver: true
+onlyBuiltDependencies:
+  - "@parcel/watcher"
+  - "@swc/core"
+  - "better-sqlite3"
+  - "core-js"
+  - "esbuild"
+  - "keytar"
+  - "koffi"
+  - "libxmljs2"
+  - "onnxruntime-node"
+  - "omniroute"
+  - "protobufjs"
+  - "sharp"
+  - "tls-client-node"
+  - "unrs-resolver"