Fix Mermaid diagram syntax in system architecture

README.md

@@ -46,10 +46,10 @@ A complete AI-powered strawberry picking system that combines **object detection
 ```mermaid
 graph TD
     A[Input Image] --> B[YOLOv8n Detector]
-    B --> C{Detected Strawberries}
+    B --> C[Detected Strawberries]
     C --> D[Crop & Resize]
     D --> E[EfficientNet-B0 Classifier]
-    E --> F{Ripeness Prediction}
+    E --> F[Ripeness Prediction]
     F --> G[Decision: Pick Only Ripe]
     
     style A fill:#f9f9f9