Refactor kafka to pure Go (franz-go), fix DBC stubs, update Dockerfile

services/gateway/README.md

@@ -0,0 +1,54 @@
+# Gateway Service
+
+WebSocket API gateway for vehicle (TRex), HMI, and mobile app connections.
+
+## What it does
+
+- Authenticates WebSocket connections via JWT
+- Routes messages to Kafka topics
+- Manages connection state in Redis
+- Serves Swagger docs
+
+## Ports
+
+| Port | Purpose |
+|------|---------|
+| 8077 | HTTP/WebSocket |
+| 11011 | Health check |
+
+## WebSocket Endpoints
+
+- `/ws/trex` - Vehicle connections
+- `/ws/hmi` - HMI connections  
+- `/ws/mobile` - Mobile app connections
+
+## Build
+
+```bash
+# Local
+go build .
+
+# Docker
+docker build -t gateway -f Dockerfile ../..
+```
+
+## Run
+
+```bash
+# Required env vars
+export KAFKA_HOSTS=localhost:9092
+export REDIS_HOST=localhost
+export JWK_URL=https://keycloak.example.com/realms/consumer/protocol/openid-connect/certs
+
+./gateway
+```
+
+## Configuration
+
+See `deploy/base/configmap-common.yaml` for all options.
+
+Key settings:
+- `KAFKA_HOSTS` - Kafka bootstrap servers
+- `REDIS_HOST/PORT` - Redis for session state
+- `JWK_URL` - JWKS endpoint for JWT validation
+- `LOG_LEVEL` - debug, info, warn, error