add vision

[BAKAOLC]

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[Copilot]

Pull Request Overview

This PR adds vision capabilities to the Discord bot by implementing image explanation functionality. The changes enable the bot to analyze and describe image content using AI services, with specific integration for Pixiv image analysis.

• Adds image explanation configuration and service methods to the AI chat provider
• Implements OpenAPI configuration for Pixiv image proxy and cookie support
• Integrates image content analysis into Pixiv artwork information preprocessing

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
appsettings.json	Adds OpenAPI configuration for Pixiv proxy and ImageExplainer AI service settings
ChatClientProviderService.cs	Implements image explanation functionality and refactors service provider usage
Program.cs	Simplifies OpenApi initialization to use service provider pattern
AiInteractions.Preprocessing.cs	Integrates image explanation into Pixiv artwork information display
AiInteractions.Chatting.cs	Refactors null checking patterns in action processing methods
OpenApi.Pixiv.cs	Adds Pixiv cookie support and image proxy URL generation
OpenApi.cs	Refactors to use service provider pattern for dependency access

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