feat: establish unified project foundation with root config cleanup

- Archive legacy packages/, services/, server/ directories
- Update pnpm workspace to web + browser-ext
- Simplify root package.json scripts to delegate to web/
- Update turbo.json for new workspace structure
- Remove obsolete root config files (vite, tsconfig, etc.)
- Add .nvmrc, .editorconfig for consistent dev environment
- Update CI workflow to remove references to deleted packages
- Add missing dependencies (@tailwindcss/vite, tailwindcss) to web
- Add test and lint scripts to web package
- Verify pnpm install, build, and dev work correctly

package.json

@@ -3,21 +3,19 @@
   "version": "0.1.0",
   "private": true,
   "workspaces": [
-    "packages/*",
-    "services/*"
+    "web",
+    "browser-ext"
   ],
   "scripts": {
-    "dev": "turbo run dev",
-    "build": "turbo run build",
-    "test": "turbo run test",
-    "test:coverage": "turbo run test:coverage",
-    "db:migrate": "turbo run db:migrate",
-    "db:seed": "turbo run db:seed",
-    "lint": "turbo run lint"
+    "dev": "pnpm --filter web dev",
+    "build": "pnpm --filter web build",
+    "test": "pnpm --filter web test",
+    "lint": "pnpm --filter web lint",
+    "db:migrate": "pnpm --filter web db:migrate",
+    "db:seed": "pnpm --filter web db:seed"
   },
   "devDependencies": {
     "@types/node": "^25.6.0",
-    "@types/ws": "^8.5.10",
     "@vitest/coverage-v8": "^4.1.5",
     "turbo": "^2.3.0",
     "typescript": "^5.7.0",
@@ -26,8 +24,5 @@
   "engines": {
     "node": ">=20.0.0"
   },
-  "packageManager": "pnpm@9.0.0",
-  "dependencies": {
-    "ws": "^8.16.0"
-  }
+  "packageManager": "pnpm@9.0.0"
 }