feat: add EUrouter AI provider

[DavidLoDico]

Summary

EUrouter is a European AI Gateway providing a single OpenAI-compatible API endpoint for European-hosted AI models with smart routing, safe fallbacks, and observability.

Changes

Files Added

• app/lib/modules/llm/providers/eurouter.ts — EUrouter provider implementation using createOpenAI from @ai-sdk/openai

Files Modified

• app/lib/modules/llm/registry.ts — Register EUrouter provider
• .env.example — Add EUROUTER_API_KEY configuration

Models Included

• DeepSeek R1 (reasoning, 64K context)
• Kimi K2.5 (multilingual, 128K context)
• Mistral Large 3 (EU-native, 128K context)
• MiniMax M2.5 (128K context)
  and more. Check our full catalog [here]:(https://www.eurouter.ai/models)

Technical Details

• Uses @ai-sdk/openai with custom baseURL (same pattern as Moonshot provider)
• No new dependencies required
• Base URL: https://api.eurouter.ai/api/v1
• Auth: Bearer token via EUROUTER_API_KEY

[DavidLoDico]

Hey @Stijnus. Kind reminder to review this PR. It adds EUrouter to Stackblitz. It enables your users to use European first AI. Safe and compliant. A hard requirement for many European users!

[DevFlex-AI]

@DavidLoDico, I am not a maintainer of this project, but this project has been practically dead/abandoned. Some free and better alternatives are https://github.com/embire2 or Https://github.com/zebbern/Devonz these are actively maintained, so you can request the providers he and they are based on bolt. diy so yeah t just to tell you.