feat: Enhance session processing and metrics

- Updated session processing commands in documentation for clarity.
- Removed transcript content fetching from session processing, allowing on-demand retrieval.
- Improved session metrics calculations and added new metrics for dashboard.
- Refactored processing scheduler to handle sessions in parallel with concurrency limits.
- Added manual trigger API for processing unprocessed sessions with admin checks.
- Implemented scripts for fetching and parsing transcripts, checking transcript content, and testing processing status.
- Updated Prisma schema to enforce default values for processed sessions.
- Added error handling and logging improvements throughout the processing workflow.

scripts/trigger-processing-direct.js

@@ -0,0 +1,20 @@
+// Direct trigger for processing scheduler (bypasses authentication)
+// Usage: node scripts/trigger-processing-direct.js
+
+import { processUnprocessedSessions } from '../lib/processingScheduler.js';
+
+async function triggerProcessing() {
+  try {
+    console.log('🚀 Manually triggering processing scheduler...\n');
+
+    // Process with custom parameters
+    await processUnprocessedSessions(50, 3); // Process 50 sessions with 3 concurrent workers
+
+    console.log('\n✅ Processing trigger completed!');
+
+  } catch (error) {
+    console.error('❌ Error triggering processing:', error);
+  }
+}
+
+triggerProcessing();