remove the variations option

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added auto insurance niche

feat: Add cost estimator for image generation in BatchForm, ExtensiveForm, and GenerationForm

feat: Enhance ad generation with trending topics integration and bulk export functionality

Refactor niche type declaration in form components

Enhance extensive ad generation with custom niche support

Refactor extensive ad generation to support batch responses

Update ad generation features and enhance user input options

Initial commit of the Ad Generator Lite project, including backend services, frontend components, and configuration files. Added core functionalities for ad generation, user management, and image processing, along with a structured matrix system for ad testing.