AIGC Generation-related models

[nighca]

close #2571.

[gemini-code-assist]

Summary of Changes

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This pull request establishes the foundational modeling for AI-generated content (AIGC) within the application. It introduces a structured approach to generating backdrops, costumes, and sprites by defining clear states and workflows for each asset type, from initial input to enriched settings and final generation. This integration aims to streamline the creation of project assets using AI capabilities.

Highlights

• New AIGC API Functions: Introduced a suite of new asynchronous functions in aigc.ts for enriching settings and generating various assets like backdrops, costumes, animations, and sprites. These functions include enrichBackdropSettings, genBackdropImage, enrichCostumeSettings, genCostumeImage, enrichAnimationSettings, genAnimationFrames, genAnimationVideo, enrichSpriteSettings, and genSpriteContentDescriptions.
• Generation Model Classes: Added three new model classes: BackdropGen, CostumeGen, and SpriteGen. Each class is responsible for managing the state and workflow of generating its respective asset type, encompassing phases like 'initial', 'enriching', 'enriched', 'generating', 'generate-failed', and 'generated'.
• State Management Integration: The new generation model classes leverage Vue's reactive utility for state management, ensuring that changes to the generation process are automatically reflected in the UI.
• Utility Import: The timeout utility from @/utils/utils has been imported into aigc.ts to manage request timeouts for AIGC API calls.
• New Type Definitions: Defined new types such as AnimationFrames, SpriteContentDescription, and SpriteContentDescriptions to structure the data related to generated animation frames and sprite content.

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[gemini-code-assist]

Code Review

This pull request introduces models and mock API endpoints for AI-powered generation of backdrops, costumes, and sprites. The overall approach of using a state machine for the generation process is sound. However, there are a couple of critical issues related to incorrect or missing function calls that will prevent the code from compiling. Additionally, there is significant code duplication across the newly added model classes (BackdropGen, CostumeGen, SpriteGen), which presents an opportunity for refactoring into a more maintainable generic base class. I've provided specific comments and suggestions to address these points.