feat: SEO/GEO admin hub — migration, sync module, routes, templates
- Migration 0019: seo_search_metrics, seo_analytics_metrics, seo_sync_log tables
- seo/ module: GSC, Bing, Umami sync + query functions (search perf, funnel, scorecard)
- Admin routes: /admin/seo hub with HTMX tabs + manual sync trigger
- Admin templates: hub page, search/funnel/scorecard partials, sidebar nav entry
- Worker: sync_gsc, sync_bing, sync_umami, cleanup_seo_metrics tasks + daily scheduler
- Config: GSC_SERVICE_ACCOUNT_PATH, GSC_SITE_URL, BING_WEBMASTER_API_KEY, BING_SITE_URL
- Deps: httpx, google-api-python-client, google-auth
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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