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/jobs/package.json

@@ -15,17 +15,21 @@
     "dev:media-transcribe": "tsx watch src/workers/media-transcribe.ts",
     "dev:emails": "tsx watch src/workers/emails.ts",
     "dev:maintenance": "tsx watch src/workers/maintenance.ts",
+    "dev:agent-course-generation": "tsx watch src/workers/agent-course-generation.ts",
     "start": "node dist/index.js",
     "start:media": "node dist/workers/media.js",
     "start:media-transcribe": "node dist/workers/media-transcribe.js",
     "start:emails": "node dist/workers/emails.js",
     "start:maintenance": "node dist/workers/maintenance.js",
+    "start:agent-course-generation": "node dist/workers/agent-course-generation.js",
     "lint": "eslint . --ext .ts",
     "format": "prettier --write ."
   },
   "dependencies": {
     "@aws-sdk/client-s3": "^3.388.0",
     "@aws-sdk/s3-request-presigner": "^3.675.0",
+    "@cio/analytics": "workspace:*",
+    "@cio/core": "workspace:*",
     "@cio/db": "workspace:*",
     "@cio/email": "workspace:*",
     "@cio/jobs": "workspace:*",