chore: init v2 project scaffold

- Add electron-vite + Vue 3 + TypeScript build config
- Add .gitignore with legacy/ exclusion
- Add AGENTS.md with architecture & dev commands
- Update README.md

tsconfig.json

@@ -0,0 +1,20 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "jsx": "preserve",
+    "lib": ["ESNext", "DOM", "DOM.Iterable"],
+    "types": ["vite/client"]
+  },
+  "references": [
+    { "path": "./tsconfig.node.json" },
+    { "path": "./tsconfig.web.json" }
+  ]
+}