fix(install): add pnpm-workspace.yaml allowBuilds + pnpm.json for pnpm 11+

pnpm 11 introduced ERR_PNPM_IGNORED_BUILDS for native addon packages.
Without explicit allowBuilds approval, these packages silently skip build scripts
and OmniRoute fails to start with missing native modules.

Changes:
- pnpm-workspace.yaml: Set allowBuilds=true for all 13 native addon packages
  (@parcel/watcher, @swc/core, better-sqlite3, core-js, esbuild, keytar, koffi,
  libxmljs2, onnxruntime-node, protobufjs, sharp, tls-client-node, unrs-resolver)
- pnpm.json: Migrate onlyBuiltDependencies from package.json (deprecated field)
  to the new pnpm.json config file per pnpm 11 spec.

Tested on: pnpm 11.9.0, Node 24, Windows 11.

Fixes: pnpm install ERR_PNPM_IGNORED_BUILDS on fresh clone with pnpm 11.

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"

pnpm.json

@@ -0,0 +1,18 @@
+{
+  "onlyBuiltDependencies": [
+    "@parcel/watcher",
+    "@swc/core",
+    "better-sqlite3",
+    "core-js",
+    "esbuild",
+    "keytar",
+    "koffi",
+    "libxmljs2",
+    "omniroute",
+    "onnxruntime-node",
+    "protobufjs",
+    "sharp",
+    "tls-client-node",
+    "unrs-resolver"
+  ]
+}