feat(perplexity-ai): update model YAMLs [bot]

[hganwani-droid]

Auto-generated by poc-agent for provider perplexity-ai.

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Note

Low Risk
Low risk metadata-only changes to Perplexity model configuration YAMLs; main risk is incorrect capability declarations affecting routing/validation of inputs/outputs.

Overview
Updates Perplexity Sonar model configs to explicitly declare supported features (e.g., structured_output, system_messages) and add modalities input/output lists across sonar, sonar-pro, sonar-reasoning-pro, sonar-deep-research, and sonar-pro-search (including text/image/doc/pdf where applicable).

Also refreshes sources links (adding the Sonar features doc) and removes/omits some previously listed max token limit fields in a few YAMLs.

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