Add public question 25 images and align attachment paths

Add the two en_6 images as data/attachments/en_25_CIB.png and data/attachments/en_25_CIB占比.png, and update question 25 to reference these paths. Question 38 remains attachment-free. No PDF or private-question attachments are included.

data/objective_questions_public_80.json

@@ -260,12 +260,12 @@
       {
         "original_filename": "CIB.png",
         "mime_type": "image/png",
-        "file_path": "attachments/en_6_CIB.png"
+        "file_path": "attachments/en_25_CIB.png"
       },
       {
         "original_filename": "CIB占比.png",
         "mime_type": "image/png",
-        "file_path": "attachments/en_6_CIB占比.png"
+        "file_path": "attachments/en_25_CIB占比.png"
       }
     ]
   },
@@ -824,4 +824,4 @@
     "language": "zh",
     "attachment": []
   }
-]
+]