[BugFix] fix 3vl dense model load quant weight (#6100)

### What this PR does / why we need it?
Fix Qwen3VL dense quant model load weights Error. 

### Does this PR introduce _any_ user-facing change?
no

### How was this patch tested?
The Qwen3VL quantized model service initialized successfully. Inference
requests are processed correctly, and valid responses are returned.

- vLLM version: v0.13.0
- vLLM main:
d68209402d

Signed-off-by: 李少鹏 <lishaopeng21@huawei.com>

vllm_ascend/quantization/quant_config.py

@@ -210,6 +210,11 @@ QUANT_MODEL_PREFIX_MAPPINGS = {
         "language_model.lm_head.": "lm_head.",
         "language_model.model.": "model.language_model.",
     },
+    "qwen3_vl_text": {
+        "visual.": "model.visual.",
+        "language_model.lm_head.": "lm_head.",
+        "language_model.model.": "model.language_model.",
+    },
 }
 
 packed_modules_model_mapping = {