Adds UI fallback in TokensTable “Available Models” column:
• Tracks models already matched to a known vendor icon.
• Collects unmatched models and renders a neutral “Other” avatar (labelled via `t('其他')`) with a tooltip listing the model names.
• Removes previous generic fallback so every model is now either vendor-specific or grouped under “Other”.
This improves clarity for users by explicitly indicating models from unrecognized providers rather than leaving them unlabelled.
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