[model] kimi_k25 support mm

[Jintao-Huang]

#9479

[gemini-code-assist]

Code Review

This pull request adds image support to the KimiK25Template class in swift/template/templates/moonshot.py by implementing custom replace_tag, _encode, _data_collator_mm_data, and _post_encode methods. The review feedback highlights three critical issues: first, replace_tag should fall back to super().replace_tag for non-image media types to prevent downstream TypeErrors; second, the list of tensors returned by _extract_image_features must be concatenated before being passed to mm_projector to avoid runtime errors; and third, the hardcoded media pad token ID should be dynamically retrieved from the tokenizer for better maintainability.

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