feat: enhance TradingView authentication debugging

- Add comprehensive debug logging to checkLoginStatus Strategy 1
- Enhanced authentication variable detection with detailed console output
- Added debug logging for window.is_authenticated and window.user checks
- Improved error visibility for authentication detection issues
- Added health API endpoint for debugging and monitoring
- Enhanced Dockerfile with better caching and debugging capabilities

Authentication detection now shows detailed logs when checking:
- window.is_authenticated variable presence and value
- window.user object detection and structure
- Helps identify why auth detection sees user data but doesn't return true

app/api/health/route.js

@@ -0,0 +1,10 @@
+import { NextResponse } from 'next/server'
+
+export async function GET() {
+  return NextResponse.json({
+    status: 'healthy',
+    timestamp: new Date().toISOString(),
+    service: 'AI Trading Bot',
+    version: '1.0.0'
+  })
+}