Support DeepSeek V4 Flash Vision Experimental

docs/issue100-vision/glm-tokenizer-control.log

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+running 1 test
+test engine::tokenizer::tests::ds4_chat_matches_original_session_tokens ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 569 filtered out; finished in 0.22s