fix(admin): restore Vite admin source files

assets/admin/tsconfig.json

@@ -0,0 +1 @@
+{"compilerOptions": {"target": "ES2020", "module": "ESNext", "moduleResolution": "bundler", "jsx": "preserve", "strict": true, "noEmit": true, "baseUrl": ".", "paths": {"@/*": ["src/*"]}}, "include": ["src/**/*.ts", "src/**/*.vue"]}