Fix automation startup issue and add AI learning documentation

- Fixed foreign key constraint violation in automation service
- Added user upsert to ensure user exists before creating automation session
- Enhanced error reporting in automation start API
- Added comprehensive AI learning system documentation
- Automation now starts successfully in simulation mode

app/api/automation/start/route.js

@@ -23,7 +23,8 @@ export async function POST(request) {
     return NextResponse.json({ 
       success: false, 
       error: 'Internal server error',
-      message: error.message 
+      message: error.message,
+      stack: error.stack 
     }, { status: 500 })
   }
 }