[example] Add KTransformers Qwen3MoE example (#9511)

Co-authored-by: unknown <xiongchenhui@hisense.ad>
Co-authored-by: Kingsley <kingsleydodonow@gmail.com>

examples/train_lora/qwen3moe_lora_sft_kt.yaml

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+### model
+model_name_or_path: Qwen/Qwen3-235B-A22B-Instruct-2507
+trust_remote_code: true
+
+### method
+stage: sft
+do_train: true
+finetuning_type: lora
+lora_rank: 8
+lora_target: all
+
+### dataset
+dataset: identity, alpaca_en_demo
+template: qwen3_nothink
+cutoff_len: 2048
+max_samples: 100000
+overwrite_cache: true
+preprocessing_num_workers: 16
+dataloader_num_workers: 4
+
+### output
+output_dir: saves/Kllama_Qwen3MoE_235bA22b
+logging_steps: 10
+save_steps: 200
+plot_loss: true
+overwrite_output_dir: true
+save_only_model: false
+report_to: none  # choices: [none, wandb, tensorboard, swanlab, mlflow]
+
+### train
+per_device_train_batch_size: 1
+gradient_accumulation_steps: 8
+learning_rate: 1.0e-4
+num_train_epochs: 3
+lr_scheduler_type: cosine
+warmup_ratio: 0.1
+bf16: true
+ddp_timeout: 180000000
+resume_from_checkpoint: null
+
+### ktransformers
+use_kt: true # use KTransformers as LoRA sft backend
+kt_optimize_rule: examples/kt_optimize_rules/Qwen3Moe-sft-amx.yaml
+cpu_infer: 32
+chunk_size: 8192
+
+### eval
+# eval_dataset: alpaca_en_demo
+# val_size: 0.1
+# per_device_eval_batch_size: 1
+# eval_strategy: steps
+# eval_steps: 500