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/package.json

@@ -40,8 +40,7 @@
   "dependencies": {
     "@aws-sdk/client-s3": "^3.388.0",
     "@aws-sdk/s3-request-presigner": "^3.675.0",
-    "@bull-board/api": "^7.0.0",
-    "@bull-board/hono": "^7.0.0",
+    "@cio/core": "workspace:*",
     "@cio/ai-assistant": "workspace:*",
     "@cio/analytics": "workspace:*",
     "@cio/certificates": "workspace:*",
@@ -50,6 +49,7 @@
     "@cio/jobs": "workspace:*",
     "@cio/question-types": "workspace:*",
     "@cio/utils": "workspace:*",
+    "@getworkbench/hono": "0.2.1",
     "@hono/node-server": "^1.19.7",
     "@hono/standard-validator": "^0.1.5",
     "@hono/zod-validator": "^0.7.6",