fix: add fsevents as optional dep to fix install on Linux (#182)

fsevents is a macOS-only native module that comes as a transitive
optional dependency of playwright. On Linux, npm tries to build it
via node-gyp which fails fatally, breaking 'npm install -g gsd-pi'.

Adding fsevents as an explicit optionalDependency at the root level
ensures npm gracefully skips it on non-macOS platforms. This is the
standard pattern used by vite, webpack, and chokidar.

package-lock.json

@@ -41,6 +41,9 @@
       },
       "engines": {
         "node": ">=20.6.0"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.2"
       }
     },
     "node_modules/@anthropic-ai/sdk": {

package.json

@@ -75,6 +75,9 @@
     "jiti": "^2.6.1",
     "typescript": "^5.4.0"
   },
+  "optionalDependencies": {
+    "fsevents": "~2.3.2"
+  },
   "overrides": {
     "gaxios": "7.1.4"
   }