WIP: Komoot import integration

Add Komoot API client, import logic, crypto helpers, integration routes,
DB schema changes, and i18n strings for the Komoot import feature.

Import processing runs as a durable pg-boss background job with retries
instead of blocking the HTTP request.

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

infrastructure/docker-compose.yml

@@ -34,6 +34,7 @@ services:
       WAHOO_CLIENT_ID: ${WAHOO_CLIENT_ID:-}
       WAHOO_CLIENT_SECRET: ${WAHOO_CLIENT_SECRET:-}
       WAHOO_WEBHOOK_TOKEN: ${WAHOO_WEBHOOK_TOKEN:-}
+      INTEGRATION_SECRET: ${INTEGRATION_SECRET:-}
     healthcheck:
       test: ["CMD-SHELL", "curl -sf http://localhost:3000/api/health || exit 1"]
       interval: 15s