Veo Video Generation Model Added

[Naveen56001]

Description
Added Veo Video Generation model with support for multiple generation modes, improved functionality, CLI integration, and documentation updates.

Related Issue
N/A (or specify if applicable)

Type of Change

New feature
Documentation update
Performance improvement

Component Affected

Video Generation (Luma AI / OpenAI Sora / Veo)
CLI Tools
Documentation

Changes Made

Added Veo video generation model
Implemented text-to-video
Implemented image-to-video
Added video generation with reference images
Added video generation with frame-based input
Added negative_prompt support
Added full CLI integration for Veo
Updated README documentation
All modes tested and validated

Testing

I have tested these changes locally
New and existing unit tests pass locally with my changes

Checklist

My code follows the project's style guidelines
I have performed a self-review of my own code
I have commented my code, particularly in hard-to-understand areas
I have made corresponding changes to the documentation
My changes generate no new warnings

Additional Notes
None

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