style(model): silence missing-import type warning

Pyright flags reportMissingImports on a third-party import. Add a targeted ignore rather than disabling the checker project-wide.

model/model_minimind.py

@@ -1,7 +1,7 @@
 import math, torch, torch.nn.functional as F
 from torch import nn
 from transformers.activations import ACT2FN
-from transformers import PreTrainedModel, GenerationMixin, PretrainedConfig
+from transformers import PreTrainedModel, GenerationMixin, PretrainedConfig  # type: ignore[reportMissingImports]
 from transformers.modeling_outputs import MoeCausalLMOutputWithPast
 
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