Refactor transcript fetching and processing scripts

- Introduced a new function `fetchTranscriptContent` to handle fetching transcripts with optional authentication.
- Enhanced error handling and logging for transcript fetching.
- Updated the `parseTranscriptToMessages` function to improve message parsing logic.
- Replaced the old session processing logic with a new approach that utilizes `SessionImport` records.
- Removed obsolete scripts related to manual triggers and whitespace fixing.
- Updated the server initialization to remove direct server handling, transitioning to a more modular approach.
- Improved overall code structure and readability across various scripts.

pages/api/admin/trigger-processing.ts

@@ -41,7 +41,7 @@ export default async function handler(
   }
 
   // Check if user has admin role
-  if (user.role !== "admin") {
+  if (user.role !== "ADMIN") {
     return res.status(403).json({ error: "Admin access required" });
   }