fix(ci): remove reserved PORT env var from Cloud Run deploy

Cloud Run sets PORT automatically from --port flag.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 5queezer

.github/workflows/deploy.yml

@@ -52,5 +52,5 @@ jobs:
             --allow-unauthenticated \
             --cpu-boost \
             --timeout 300 \
-            --set-env-vars "TRANSPORT=streamable-http,HOST=0.0.0.0,PORT=8000,LOG_LEVEL=WARNING,HEADLESS=true" \
+            --set-env-vars "TRANSPORT=streamable-http,HOST=0.0.0.0,LOG_LEVEL=WARNING,HEADLESS=true" \
             --set-secrets "OAUTH_PASSWORD=OAUTH_PASSWORD:latest,OAUTH_BASE_URL=OAUTH_BASE_URL:latest,AUTH=AUTH:latest"