minhphuc429 acc228b920 feat: implement /v1/messages/count_tokens endpoint ...

Add Anthropic-compatible token counting endpoint using hybrid approach:
- Local estimation with gpt-tokenizer for text content (~95% accuracy)
- API-based counting for complex content (images, documents)
- Automatic fallback to local estimation on API errors

This resolves warnings in LiteLLM and other clients that rely on
pre-request token counting.

2026-01-14 15:32:27 +07:00

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