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/utils/src/validation/organization/organization.ts

@@ -18,7 +18,9 @@ export type TGetOrganizations = z.infer<typeof ZGetOrganizations>;
 
 export const ZGetCoursesBySiteName = z.object({
   siteName: z.string().min(1),
-  tags: z.string().optional()
+  tags: z.string().optional(),
+  page: z.coerce.number().int().min(1).optional(),
+  limit: z.coerce.number().int().min(1).max(100).optional()
 });
 
 export type TGetCoursesBySiteName = z.infer<typeof ZGetCoursesBySiteName>;
@@ -128,6 +130,18 @@ export const ZRemoveTeamMember = z.object({
 
 export type TRemoveTeamMember = z.infer<typeof ZRemoveTeamMember>;
 
+export const ZCreateLinkInvite = z.object({
+  roleId: z.number().int().positive()
+});
+
+export type TCreateLinkInvite = z.infer<typeof ZCreateLinkInvite>;
+
+export const ZToggleLinkInvite = z.object({
+  isRevoked: z.boolean()
+});
+
+export type TToggleLinkInvite = z.infer<typeof ZToggleLinkInvite>;
+
 export const ZGetUserAnalytics = z.object({
   userId: z.uuid()
 });