docs: add agent workflows for frontend, backend, and extension

Author: tranhoangpich

.agent/workflows/backend.md

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+---
+description: How to manage and deploy the verifyOS-backend service
+---
+
+// turbo-all
+# Backend Management Workflow
+
+This workflow covers development and deployment for the verifyOS-backend located in `apps/backend`.
+
+## Local Development
+
+1. Navigate to the backend directory:
+   `cd apps/backend`
+
+2. Run the server in development mode:
+   `cargo run`
+
+3. The server will be available at `http://localhost:7070`.
+
+## Deployment to AWS App Runner
+
+This service is deployed manually using the included deployment script.
+
+1. Ensure your AWS CLI is configured with correct credentials.
+
+2. Run the deployment script from the backend directory:
+   `./deploy.sh`
+
+The script will:
+- Login to Amazon ECR.
+- Build the Docker image for `linux/amd64`.
+- Push the image to ECR.
+- Trigger a service update on AWS App Runner.

.agent/workflows/extension.md

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+---
+description: How to build and publish the verifyOS VS Code Extension
+---
+
+// turbo-all
+# VS Code Extension Management Workflow
+
+This workflow covers development and publishing for the verifyOS-vscode extension located in `editors/vscode`.
+
+## Local Development
+
+1. Navigate to the extension directory:
+   `cd editors/vscode`
+
+2. Install dependencies:
+   `npm install`
+
+3. Compile the extension:
+   `npm run compile`
+
+4. To test, open the directory in VS Code and press `F5` to launch the Extension Development Host.
+
+## Packaging and Publishing
+
+1. Packaging the extension (`.vsix`):
+   `npm run package`
+
+2. Publishing to VS Code Marketplace:
+   `npm run publish:vsce`
+
+3. Publishing to Open VSX:
+   `npm run publish:ovsx`

.agent/workflows/frontend.md

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+---
+description: How to manage and deploy the verifyOS-frontend (Web App)
+---
+
+// turbo-all
+# Frontend Management Workflow
+
+This workflow covers development and deployment for the verifyOS-frontend located in `apps/frontend`.
+
+## Local Development
+
+1. Navigate to the frontend directory:
+   `cd apps/frontend`
+
+2. Install dependencies (if needed):
+   `npm install`
+
+3. Run the development server:
+   `npm run dev`
+
+4. Access the app at `http://localhost:3000`.
+
+## Deployment
+
+The frontend is built as a standard Next.js application and is currently deployed to Vercel.
+
+1. To create a production build:
+   `npm run build`
+
+2. To deploy, push changes to the `main` branch which triggers the Vercel integration, or use the Vercel CLI from `apps/frontend`:
+   `vercel --prod`