### What this PR does / why we need it?
Remove legacy input mapper/processor from V0.
Find more details at
https://github.com/vllm-project/vllm-ascend/issues/673 and
https://github.com/vllm-project/vllm/pull/15686.
### Does this PR introduce _any_ user-facing change?
no.
### How was this patch tested?
Launch online service:
```bash
vllm serve Qwen/Qwen2.5-VL-7B-Instruct \
--dtype bfloat16 \
--max_model_len 32768 \
--max-num-batched-tokens 32768
```
Query the server:
```bash
curl http://localhost:8000/v1/chat/completions \
-H "Content-Type: application/json" \
-d '{
"model": "Qwen/Qwen2.5-VL-7B-Instruct",
"messages": [
{"role": "system", "content": "You are a helpful assistant."},
{"role": "user", "content": [
{"type": "image_url", "image_url": {"url": "https://modelscope.oss-cn-beijing.aliyuncs.com/resource/qwen.png"}},
{"type": "text", "text": "What is the text in the illustrate?"}
]}
]
}'
```
Result:
```bash
{"id":"chatcmpl-619e70733ed148b3be3a0b6524ee0ef3","object":"chat.completion","created":1748226332,"model":"/home/sss/.cache/modelscope/hub/models/Qwen/Qwen2___5-VL-7B-Instruct","choices":[{"index":0,"message":{"role":"assistant","reasoning_content":null,"content":"The text in the illustration reads \"TONGYI Qwen.\"","tool_calls":[]},"logprobs":null,"finish_reason":"stop","stop_reason":null}],"usage":{"pro
```
Signed-off-by: shen-shanshan <467638484@qq.com>
Co-authored-by: wangxiyuan <wangxiyuan1007@gmail.com>
93860574bb
