feat: enhance asset import functionality and unit tracking

- Added WHISPER_URL environment variable to docker-compose for audio transcription service.
- Updated Nginx configuration to increase timeout settings for API requests.
- Enhanced asset ingestion process to extract unit numbers from ZIP entry paths, supporting various naming conventions.
- Implemented logic to split intensive courses into two regular courses during asset import.
- Added new fields to the Asset and QuestionBank models to track unit numbers and source asset links.
- Introduced backward-compatible fallbacks for fetching study plans and courses from legacy MySQL database.
- Improved error handling and progress tracking during ZIP file uploads in the frontend.
- Created a new SQL migration to add unit_number and source_asset_id columns to the assets and question_bank tables, along with necessary indexes for performance.

nginx/studio.conf

@@ -18,10 +18,10 @@ location /cms-api/ {
     proxy_set_header X-Forwarded-Proto $http_x_forwarded_proto;
     proxy_set_header Connection "";
     proxy_http_version 1.1;
-    proxy_connect_timeout 120s;
-    proxy_send_timeout 3600s;
-    proxy_read_timeout 3600s;
-    send_timeout 3600s;
+    proxy_connect_timeout 300s;
+    proxy_send_timeout 7200s;
+    proxy_read_timeout 7200s;
+    send_timeout 7200s;
 }
 
 location /lms-api/ {