feat: Add image upload support to ChatOpenRouter node

[aibysid]

• Create FlowiseChatOpenRouter wrapper class implementing IVisionChatModal
• Add allowImageUploads and imageResolution input fields
• Support multimodal image inputs for OpenRouter models
• Follows same pattern as ChatOpenAI implementation

Resolves #5143

[gemini-code-assist[bot]]

Summary of Changes

Hello @aibysid, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the ChatOpenRouter node by integrating multimodal capabilities, specifically allowing users to provide image inputs to OpenRouter models. It introduces new configuration options for image handling and leverages a dedicated wrapper class to manage this functionality, aligning with existing multimodal implementations within the system.

Highlights

• Image Upload Support: The ChatOpenRouter node now supports image uploads, enabling multimodal input for OpenRouter models.
• New Input Fields: Added 'Allow Image Uploads' (boolean) and 'Image Resolution' (options: Low, High, Auto) to the node's configuration, displayed conditionally.
• Wrapper Class Implementation: Introduced FlowiseChatOpenRouter as a wrapper around LangchainChatOpenAI, implementing the IVisionChatModal interface to manage multimodal options.
• Consistent Pattern: The implementation follows the established pattern used for the ChatOpenAI node, ensuring consistency across chat models.

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