Enhance: Implement dynamic launcher URL and restore package.json

- Added logic to construct launcher URL based on hydrated device context.
- Implemented dev/production host fallback for demo.localhost.
- Restored missing package.json with proper start and build scripts.
- Finalized IPC handlers for seed and device configuration.

package.json

@@ -0,0 +1,18 @@
+{
+  "name": "aether_app_native_electron",
+  "version": "1.0.0",
+  "description": "AE Native Launcher V3",
+  "main": "dist/main/index.js",
+  "scripts": {
+    "start": "tsc && electron .",
+    "dev": "tsc && electron .",
+    "build": "tsc",
+    "watch": "tsc -w"
+  },
+  "devDependencies": {
+    "@types/node": "^22.10.7",
+    "electron": "^34.0.0",
+    "ts-node": "^10.9.2",
+    "typescript": "^5.7.3"
+  }
+}