Add production CI/CD deployment pipeline

Add GHCR image build/push and SSH-based server deployment workflow, production compose/env templates, and deployment script. Also fix frontend container healthcheck target and extend Docker CI with frontend health verification.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

devops/docker-compose.yml

@@ -33,7 +33,7 @@ services:
       CHROME_PATH: /usr/bin/chromium
       NODE_ENV: production
     healthcheck:
-      test: ["CMD-SHELL", "curl -f http://localhost:5000/health || exit 1"]
+      test: ["CMD-SHELL", "node -e \"const h=require('http');h.get('http://localhost:5000/health',(r)=>process.exit(r.statusCode===200?0:1)).on('error',()=>process.exit(1))\""]
       interval: 15s
       timeout: 10s
       retries: 3
@@ -55,7 +55,7 @@ services:
       NEXT_PUBLIC_SUPABASE_ANON_KEY: ${NEXT_PUBLIC_SUPABASE_ANON_KEY:-}
       NODE_ENV: production
     healthcheck:
-      test: ["CMD-SHELL", "curl -f http://localhost:3000 || exit 1"]
+      test: ["CMD-SHELL", "node -e \"const h=require('http');h.get('http://localhost:3000',(r)=>process.exit(r.statusCode===200?0:1)).on('error',()=>process.exit(1))\""]
       interval: 15s
       timeout: 10s
       retries: 3