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/dashboard/session/[id].ts

@@ -67,7 +67,7 @@ export default async function handler(
         prismaSession.messages?.map((msg) => ({
           id: msg.id,
           sessionId: msg.sessionId,
-          timestamp: new Date(msg.timestamp),
+          timestamp: msg.timestamp ? new Date(msg.timestamp) : new Date(),
           role: msg.role,
           content: msg.content,
           order: msg.order,