feat(deploy): add docker

deploy/README.md

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+# IAM Front Deployment Guide
+
+## 1. Prerequisites
+
+- Docker & Docker Compose installed
+- `iam-service` running (and accessible from this host)
+- `.env` file configured (copied from `.env.example`)
+
+## 2. Configuration (.env)
+
+Ensure `.env` exists in `iam-front/` root.
+
+**Critical Variables:**
+
+- `IAM_SERVICE_BASE_URL`: URL to access iam-service.
+  - **Docker Note**: Do NOT use `localhost` or `127.0.0.1`. Use the host IP (e.g. `http://192.168.1.100:3000`).
+- `CAPTCHA_SECRET`: Secure random string for cookie signing.
+- `PORT`: Optional, defaults to 6020.
+
+## 3. Deploy
+
+```bash
+cd deploy/docker
+bash start.sh
+```
+
+This will:
+1. Validate `.env` configuration (checks for localhost issues).
+2. Build the Docker image.
+3. Start the container with ports mapped (default 6020).
+
+## 4. Stop
+
+```bash
+cd deploy/docker
+bash stop.sh
+```
+
+## 5. Notes
+
+- This deployment only includes the `iam-front` service.
+- It assumes `iam-service` is deployed separately.
+- No database or Redis is required for the frontend.