fix: raise value error on no file support

[greysonlalonde]

Note

Medium Risk
Introduces a new ValueError for calls that include files on models without multimodal support, which can break previously-silent workflows. Model capability detection is also expanded (Claude 4 variants), so behavior may change for some model strings.

Overview
File attachments now fail fast on unsupported models. When crewai_files is installed, _process_message_files/_aprocess_message_files (in both LLM and BaseLLM) now raise a clear ValueError if any message includes files but the selected model doesn’t support multimodal input, instead of silently ignoring file inputs.

Expanded multimodal model matching. Multimodal detection was updated to recognize additional Claude 4 model name variants in the LiteLLM path, the Anthropic native provider, and Bedrock model prefixes.

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