Add Sentry source maps and release tracking

- @sentry/vite-plugin uploads source maps during Docker build
- Release tagged with git SHA (SENTRY_RELEASE) on both client and server
- Environment set to production/development for filtering
- CD passes SENTRY_AUTH_TOKEN + SENTRY_RELEASE as Docker build args
- docker-compose passes SENTRY_RELEASE to runtime containers

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

infrastructure/docker-compose.yml

@@ -26,6 +26,7 @@ services:
       SESSION_SECRET: ${SESSION_SECRET:-change-me-in-production}
       NODE_ENV: production
       PORT: 3000
+      SENTRY_RELEASE: ${SENTRY_RELEASE:-}
     depends_on:
       postgres:
         condition: service_healthy
@@ -38,6 +39,7 @@ services:
       DATABASE_URL: postgres://trails:${POSTGRES_PASSWORD:-trails}@postgres:5432/trails
       NODE_ENV: production
       PORT: 3001
+      SENTRY_RELEASE: ${SENTRY_RELEASE:-}
     depends_on:
       postgres:
         condition: service_healthy