fix: update docker setup provider hints

docs/install/docker.md

@@ -31,7 +31,7 @@ From repo root:
 This script:
 - builds the gateway image
 - runs the onboarding wizard
-- runs WhatsApp login
+- prints optional provider setup hints
 - starts the gateway via Docker Compose
 
 It writes config/workspace on the host:
@@ -43,10 +43,30 @@ It writes config/workspace on the host:
 ```bash
 docker build -t clawdbot:local -f Dockerfile .
 docker compose run --rm clawdbot-cli onboard
-docker compose run --rm clawdbot-cli login
 docker compose up -d clawdbot-gateway
 ```
 
+### Provider setup (optional)
+
+Use the CLI container to configure providers, then restart the gateway if needed.
+
+WhatsApp (QR):
+```bash
+docker compose run --rm clawdbot-cli providers login
+```
+
+Telegram (bot token):
+```bash
+docker compose run --rm clawdbot-cli providers add --provider telegram --token "<token>"
+```
+
+Discord (bot token):
+```bash
+docker compose run --rm clawdbot-cli providers add --provider discord --token "<token>"
+```
+
+Docs: [WhatsApp](/providers/whatsapp), [Telegram](/providers/telegram), [Discord](/providers/discord)
+
 ### Health check
 
 ```bash