SECURITY: Remove credential exposure from logs

- Replace full config logging with sanitized version
- Credentials now show as [REDACTED] in console logs
- Fixed in: enhanced-screenshot service, API routes, test files
- Prevents TradingView email/password from appearing in container logs

lib/enhanced-screenshot.ts

@@ -28,7 +28,13 @@ export class EnhancedScreenshotService {
 
   async captureWithLogin(config: ScreenshotConfig): Promise<string[]> {
     console.log('🚀 Enhanced Screenshot Service - Docker Environment (Dual Session)')
-    console.log('📋 Config:', config)
+    console.log('📋 Config:', {
+      symbol: config.symbol,
+      timeframe: config.timeframe,
+      layouts: config.layouts,
+      sessionId: config.sessionId,
+      credentials: '[REDACTED]'
+    })
     
     const screenshotFiles: string[] = []
     const { sessionId } = config