feat: upgrade to version 2.0.0-alpha with mainstream dependencies

- Update application version to 2.0.0-alpha
- Update application name to 'Ambient Light Control'
- Upgrade Node.js requirement to >=22.0.0 (current LTS)
- Upgrade pnpm requirement to >=10.0.0 (current stable)
- Update all GitHub Actions workflows to use Node.js 22 and pnpm 10
- Update README.md with current version requirements
- Add comprehensive project metadata to package.json
- Remove obsolete src-tauri/src-tauri directory structure
- Update Cargo.toml with proper project information

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2.0.0",
-  "productName": "test-demo",
-  "version": "0.0.1",
+  "productName": "Ambient Light Control",
+  "version": "2.0.0-alpha",
   "identifier": "cc.ivanli.ambient-light.desktop",
   "build": {
     "beforeDevCommand": "pnpm dev",
@@ -23,7 +23,7 @@
       {
         "fullscreen": false,
         "resizable": true,
-        "title": "test-demo",
+        "title": "Ambient Light Control",
         "width": 800,
         "height": 600
       }