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

turbo.json

@@ -5,7 +5,7 @@
   "tasks": {
     "build": {
       "dependsOn": ["^build"],
-      "outputs": ["dist/**", ".next/**", "!.next/cache/**"]
+      "outputs": ["dist/**", ".output/**"]
     },
     "dev": {
       "cache": false,
@@ -15,10 +15,6 @@
       "dependsOn": ["^build"],
       "outputs": ["coverage/**"]
     },
-    "test:coverage": {
-      "dependsOn": ["^build"],
-      "outputs": ["coverage/**"]
-    },
     "lint": {
       "outputs": []
     },
@@ -30,6 +26,9 @@
     },
     "db:migrate": {
       "cache": false
+    },
+    "db:seed": {
+      "cache": false
     }
   }
 }