`truncation` is hardcoded and cannot be controlled externally

[msdsm]

Currently, truncation is hardcoded to True within the Qwen3VLEmbedder class.
This can cause the following ValueError when processing long texts or videos, preventing the process from completing successfully.

ValueError: Mismatch in video token count between text and input_ids. Got ids=[8075] and text=[9360]. Likely due to truncation='max_length'. Please disable truncation or increase max_length.

To resolve this, I propose allowing truncation to be specified as an external parameter. This would enable users to set truncation=False when needed to avoid this error.