fix(training): resolve Gin route param conflicts for content/media routes

Use consistent :moduleId param name for content routes and :mediaId for
media routes. Add param adapters for handlers that expect different names.
Fix frontend media API paths to match backend route structure.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin-compliance/lib/sdk/training/api.ts

@@ -292,11 +292,11 @@ export async function getModuleMedia(moduleId: string): Promise<{ media: Trainin
 }
 
 export async function getMediaURL(mediaId: string): Promise<{ bucket: string; object_key: string; mime_type: string }> {
-  return apiFetch(`/media/module/${mediaId}/url`)
+  return apiFetch(`/media/${mediaId}/url`)
 }
 
 export async function publishMedia(mediaId: string, publish?: boolean): Promise<{ status: string; is_published: boolean }> {
-  return apiFetch(`/media/module/${mediaId}/publish`, {
+  return apiFetch(`/media/${mediaId}/publish`, {
     method: 'POST',
     body: JSON.stringify({ publish: publish !== false }),
   })