Card: base_model_relation: quantized (so the conversion lists under the base model's Quantizations, not Finetunes)

README.md

@@ -17,6 +17,7 @@ language:
   - zh
 pipeline_tag: text-generation
 library_name: coreai
+base_model_relation: quantized
 ---
 
 # BitCPM-8B → Apple Core AI (1.58-bit ternary, on-device)