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

packages/jobs/src/payloads/agent-course-generation.ts

@@ -0,0 +1,15 @@
+import * as z from 'zod';
+
+/**
+ * Payload for long-running AI course-generation runs.
+ *
+ * The worker re-loads the full run from Postgres by id. Keep the queue payload
+ * tiny so retries always use the latest durable run state and checkpoints.
+ */
+export const ZAgentCourseGenerationPayload = z.object({
+  runId: z.string().uuid(),
+  requestedByUserId: z.string().uuid(),
+  organizationId: z.string().uuid()
+});
+
+export type TAgentCourseGenerationPayload = z.infer<typeof ZAgentCourseGenerationPayload>;

packages/jobs/src/payloads/index.ts

@@ -1,3 +1,4 @@
 export * from './media';
 export * from './emails';
 export * from './maintenance';
+export * from './agent-course-generation';

packages/jobs/src/payloads/maintenance.ts

@@ -23,6 +23,15 @@ export type TDeadLetterCleanupPayload = z.infer<typeof ZDeadLetterCleanupPayload
  * stops blocking new runs after a worker crash, server restart, or lost
  * BullMQ job.
  */
+/**
+ * Daily aggregation of raw analytics page events into the daily rollup tables.
+ * Defaults to rolling up yesterday's data.
+ */
+export const ZAnalyticsDailyRollupPayload = z.object({
+  daysAgo: z.number().int().positive().default(1)
+});
+export type TAnalyticsDailyRollupPayload = z.infer<typeof ZAnalyticsDailyRollupPayload>;
+
 export const ZMediaJobReapPayload = z.object({
   staleAfterMinutes: z.number().int().positive().default(30)
 });