📝 docs: Add AGENTS.md for Project Structure and Coding Standards (#11866)

* 📝 docs: Add AGENTS.md for project structure and coding standards

- Introduced AGENTS.md to outline project workspaces, coding standards, and development commands.
- Defined workspace boundaries for backend and frontend development, emphasizing TypeScript usage.
- Established guidelines for code style, iteration performance, type safety, and import order.
- Updated CONTRIBUTING.md to reference AGENTS.md for coding standards and project conventions.
- Modified package.json to streamline build commands, consolidating frontend and backend build processes.

* chore: Update build commands and improve smart reinstall process

- Modified AGENTS.md to clarify the purpose of `npm run smart-reinstall` and other build commands, emphasizing Turborepo's role in dependency management and builds.
- Updated package.json to streamline build commands, replacing the legacy frontend build with a Turborepo-based approach for improved performance.
- Enhanced the smart reinstall script to fully delegate build processes to Turborepo, including cache management and dependency checks, ensuring a more efficient build workflow.

package.json

@@ -48,6 +48,7 @@
     "build:client": "cd client && npm run build",
     "build:client-package": "cd packages/client && npm run build",
     "build:packages": "npm run build:data-provider && npm run build:data-schemas && npm run build:api && npm run build:client-package",
+    "build": "npx turbo run build",
     "frontend": "npm run build:data-provider && npm run build:data-schemas && npm run build:api && npm run build:client-package && cd client && npm run build",
     "frontend:ci": "npm run build:data-provider && npm run build:client-package && cd client && npm run build:ci",
     "frontend:dev": "cd client && npm run dev",