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/dashboard/src/routes/(org-site)/+layout.svelte

@@ -3,8 +3,8 @@
   import { currentOrg } from '$lib/utils/store/org';
   import { onMount } from 'svelte';
   import { afterNavigate } from '$app/navigation';
-  import { env } from '$env/dynamic/public';
   import { analytics } from '@cio/analytics/client';
+  import { getRequestBaseUrl } from '$lib/utils/services/api';
   import type { Snippet } from 'svelte';
   import type { AccountOrg } from '$features/app/types';
 
@@ -19,10 +19,11 @@
   let { children, data }: Props = $props();
 
   onMount(() => {
-    if (!env.PUBLIC_SERVER_URL) return;
+    const apiBaseUrl = getRequestBaseUrl();
+    if (!apiBaseUrl) return;
 
     analytics.init({
-      endpoint: `${env.PUBLIC_SERVER_URL.replace(/\/$/, '')}/dash/track`,
+      endpoint: `${apiBaseUrl.replace(/\/$/, '')}/dash/track`,
       orgId: data.org?.id ?? undefined
     });
     analytics.pageView({ kind: 'landing' });