Add video generation support: UI controls, payload handling, and DTO fields

[LJR199887]

Motivation

• Introduce video generation support end-to-end so users can request short videos with size, duration, and quality parameters.
• Ensure the frontend exposes video-specific controls only for video-capable models and that payloads are routed to the proper video endpoint.
• Extend backend DTO to accept video parameters so the server can forward them to upstream video APIs.

Description

• Added Seconds and Quality fields to GeneralOpenAIRequest DTO to allow video-specific parameters to be sent in requests.
• Added a new API endpoint constant VIDEO_GENERATIONS and default input values videoSize, videoSeconds, and videoQuality in DEFAULT_CONFIG.
• Extended SettingsPanel.jsx to detect video models and show selects for video size, seconds, and quality, and wire them to onInputChange.
• Updated buildApiPayload to detect video models, force non-streaming behavior for video requests, and add size, seconds, and quality to the request payload.
• Implemented video-aware logic in useApiRequest.jsx: added helpers to detect video payloads, extract text/image from message content, build simplified video request payloads, route to the VIDEO_GENERATIONS endpoint, and handle non-stream responses for video tasks by summarizing task info into the UI message; updated sendRequest to respect forced non-stream for video requests.

Testing

• Ran the existing JavaScript test and lint commands (yarn test and yarn lint) against the modified codebase and they passed.
• Performed a local development build of the web UI (yarn start) to validate compilation and basic runtime behavior without errors.

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Codex Task

[LJR199887]

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[LJR199887]

1