add tunnel-only setup with Docker, including Dockerfile, docker-compose, and scripts

new-backend/TUNNEL-ONLY-QUICKSTART.md

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+# Quick Start - Tunnel Only Mode
+
+## What This Does
+- Runs **only** the Cloudflare tunnel in Docker
+- Your backend runs **outside Docker** on port 9090
+- Tunnel forwards traffic from `api.ishikabhoyar.tech` to your local backend
+
+## Quick Start
+
+### Step 1: Start your backend on port 9090
+```bash
+PORT=9090 go run main.go
+```
+
+### Step 2: Start the tunnel
+
+**Windows (PowerShell):**
+```powershell
+.\start-tunnel-only.ps1
+```
+
+**Linux/Mac:**
+```bash
+chmod +x start-tunnel-only.sh
+./start-tunnel-only.sh
+```
+
+**Or manually:**
+```bash
+docker-compose -f docker-compose.tunnel-only.yml up --build
+```
+
+## Files Created
+
+1. **Dockerfile.tunnel-only** - Lightweight Docker image with only cloudflared
+2. **docker-compose.tunnel-only.yml** - Docker Compose config for tunnel only
+3. **config.tunnel-only.json** - Cloudflare tunnel config pointing to port 9090
+4. **start-tunnel-only.ps1** - PowerShell helper script
+5. **start-tunnel-only.sh** - Bash helper script
+6. **README.tunnel-only.md** - Detailed documentation
+
+## Test It
+
+1. Start backend: `PORT=9090 go run main.go`
+2. Start tunnel: `docker-compose -f docker-compose.tunnel-only.yml up --build`
+3. Test: `curl https://api.ishikabhoyar.tech`
+
+## Stop
+
+```bash
+docker-compose -f docker-compose.tunnel-only.yml down
+```
+
+## Troubleshooting
+
+**Backend not reachable?**
+- Check backend is running: `curl http://localhost:9090`
+- Check tunnel logs: `docker-compose -f docker-compose.tunnel-only.yml logs -f`
+
+**Tunnel not connecting?**
+- Verify credentials.json and cert.pem are valid
+- Check Cloudflare dashboard
+
+## Original Files (Unchanged)
+
+The original tunnel setup files are still available:
+- `Dockerfile.tunnel` - Backend + Tunnel in one container
+- `docker-compose.tunnel.yml` - Original compose file
+- These files still point to port 8080