feat(analytics): retire Rybbit and add SEO/GEO discovery tracking

Document Umami as the sole analytics platform, remove Rybbit proxy and
tracker code, and classify public page traffic with discovery_channel for
adm SEO/GEO dashboards.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/portal-integration-services-bootstrap.mjs

@@ -4,9 +4,6 @@ import {
   resolveAnalyticsPlan,
   sendMindSpaceAnalyticsEvent,
 } from '../mindspace-analytics.mjs';
-import {
-  sendMindSpaceRybbitEvent,
-} from '../mindspace-rybbit.mjs';
 import { createPageEditSessionService } from '../mindspace-page-edit-session.mjs';
 import { createNotificationDispatcher } from '../notification-dispatcher.mjs';
 import { startScheduleReminderWorker } from '../schedule-reminder-worker.mjs';
@@ -39,7 +36,6 @@ export async function bootstrapPortalIntegrationServices({
   chatIntentRouter,
   systemDisclosurePolicyService,
   mindSpaceAnalyticsConfig,
-  mindSpaceRybbitConfig,
   subscriptionService,
   apiTarget,
   apiSecret,
@@ -54,8 +50,6 @@ export async function bootstrapPortalIntegrationServices({
   resolveAnalyticsPlanFn = resolveAnalyticsPlan,
   sendMindSpaceAnalyticsEventFn =
     sendMindSpaceAnalyticsEvent,
-  sendMindSpaceRybbitEventFn =
-    sendMindSpaceRybbitEvent,
   createNotificationDispatcherFn =
     createNotificationDispatcher,
   startScheduleReminderWorkerFn =
@@ -214,10 +208,6 @@ export async function bootstrapPortalIntegrationServices({
             config: mindSpaceAnalyticsConfig,
             ...analyticsPayload,
           });
-          void sendMindSpaceRybbitEventFn({
-            config: mindSpaceRybbitConfig,
-            ...analyticsPayload,
-          });
         }
       },
       applySessionLlmProvider: (sessionId) =>