fix: PCB use pcb3/bad009 (Wrong Position), candle prompt with numbered labels and total count

app.py

@@ -262,10 +262,10 @@ EXAMPLES = [
         "The first image is a normal sample. Please locate the defects within the second image with bounding box in JSON format.",
         256,
     ],
-    # 4. Defect Localization — leather cut
+    # 4. Defect Localization — PCB wrong position
     [
-        "examples/leather_good.jpg",
-        "examples/leather_cut.jpg",
+        "examples/pcb_good.jpg",
+        "examples/pcb_defect.jpg",
         "The first image is a normal sample. Please locate the defects within the second image with bounding box in JSON format.",
         256,
     ],
@@ -273,7 +273,7 @@ EXAMPLES = [
     [
         None,
         "examples/candle_count.jpg",
-        "How many candles are in this image? For each candle, give its bounding box as {\"bbox_2d\": [x1,y1,x2,y2], \"label\": \"candle_N\"}.",
+        "How many candles are in this image? For each candle, give its bounding box as {\"bbox_2d\": [x1,y1,x2,y2], \"label\": \"candle_1\"}, numbering them 1, 2, 3, etc. State the total count at the end.",
         512,
     ],
     # 7. Industrial OCR (single image) — drink bottle