feat: HLS streaming, transcripts, agent course generation & landing-page course previews (#663)

New features:
- HLS video encoding/streaming (hls routes, hls-encoder) and a media
  transcripts pipeline (transcripts route + media-transcript queries)
- AI assistant chat vs. run model: agent-course-generation worker/queue,
  run-monitor pane, chat-changes card, content ask-ai bar
- Per-theme course-page previews across org landing-page themes (bold,
  classic, corporate, editorial, etc.) with a shared course token/component set
- View-as-student mode and login-link / link-invite invite flows

Refactor:
- Extract packages/core consolidating config (env, storage, dashboard-url),
  services and utils previously duplicated under apps/api/src/config
- Remove legacy agent service modules (chat-tools, chat-context,
  context-window, document, fetch-url, lesson-content)
- Relax Cross-Origin-Resource-Policy to allow cross-origin media embedding
- Add format script to tenant-router so turbo run format covers it

apps/api/src/services/program/goal.ts

@@ -1,6 +1,6 @@
 import { AppError, ErrorCodes } from '@api/utils/errors';
 import { enqueueTransactionalEmail } from '@api/services/jobs';
-import { getDashboardBaseUrl } from '@api/config/dashboard-url';
+import { getDashboardBaseUrl } from '@cio/core/config/dashboard-url';
 import {
   countAssignmentsByStatus,
   createProgramGoal,
@@ -408,7 +408,11 @@ export async function runProgramGoalReminderScan(): Promise<{
 
     if (!matchesReminder) continue;
 
-    const loginUrl = getDashboardBaseUrl(row.organizationSiteName ?? undefined);
+    const loginUrl = getDashboardBaseUrl({
+      siteName: row.organizationSiteName,
+      customDomain: row.organizationCustomDomain,
+      isCustomDomainVerified: row.organizationIsCustomDomainVerified
+    });
     const dayKey = now.toISOString().slice(0, 10);
 
     try {