Add Lekai prompt model checkpoint

lekai_prompt_model/README.md

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+# Lekai Prompt Model
+
+Initial accompaniment prompt model used by the StreamMUSE/RT-accompanimentV2 Lekai prompt-continuation path.
+
+Files:
+- `model.safetensors`: prompt accompaniment checkpoint.
+- `config.json`: checkpoint config copied from `checkpoints/best_model`.
+
+Expected local integration code:
+- StreamMUSE: `src/streammuse/infrastructure/inference/lekai_prompt_continuation/prompt_model/`
+- RT source copy: `external/lekai_real_time/prompt_model/`
+
+Typical StreamMUSE environment variable:
+
+```bash
+export LEKAI_PROMPT_CHECKPOINT_PATH=/path/to/lekai_prompt_model/model.safetensors
+```

lekai_prompt_model/config.json

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+{
+  "architectures": [
+    "PianoLLaMA"
+  ],
+  "attention_bias": false,
+  "attention_dropout": 0.1,
+  "bos_token_id": 257,
+  "dtype": "float32",
+  "eos_token_id": 256,
+  "head_dim": 128,
+  "hidden_act": "silu",
+  "hidden_size": 768,
+  "initializer_range": 0.02,
+  "intermediate_size": 3072,
+  "max_position_embeddings": 8192,
+  "mlp_bias": false,
+  "model_type": "llama",
+  "num_attention_heads": 6,
+  "num_hidden_layers": 16,
+  "num_key_value_heads": 6,
+  "pad_token_id": 258,
+  "pretraining_tp": 1,
+  "rms_norm_eps": 1e-06,
+  "rope_parameters": {
+    "rope_theta": 10000.0,
+    "rope_type": "default"
+  },
+  "tie_word_embeddings": false,
+  "transformers_version": "5.4.0",
+  "use_cache": true,
+  "vocab_size": 268
+}

lekai_prompt_model/model.safetensors

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+version https://git-lfs.github.com/spec/v1
+oid sha256:8d13485ccf5958dd3340d98123209f9f6e7ddb63494717af3c82b29db718fce7
+size 605744920