Update deepseek-v4-flash.yaml

[yagoiroot]

What this changes

Added further details about reasoning effort options that are accepted by the API but get silently mapped to the actual supported options. source: https://api-docs.deepseek.com/guides/thinking_mode/

Type of change

Tick whatever fits. This just helps reviewers triage; nothing is enforced.

• Add a model (new YAML file under models/)
• Add a provider (new folder under models/, plus a logo)
• Add or update parameters on an existing model
• Fix incorrect data (default, range, values, applicability)
• Site or tooling (code under src/, docs, CI)

Source

https://api-docs.deepseek.com/guides/thinking_mode/

Before opening

• npm run validate and npm test pass locally
• Filenames follow the convention: models/<provider>/<model>.yaml, or <model>-subscription.yaml for the subscription route
• No existing parameter was removed (removals are blocked, see CONTRIBUTING)

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