[FEATURE] Add GLM 5 + MiniMax M2.5 to model registry

[darkBuddha]

Scope check

• This is core LLM communication (not application logic)
• This benefits most users (not just my use case)
• This can't be solved in application code with current RubyLLM
• I read the Contributing Guide

Due diligence

• I searched existing issues
• I checked the documentation

What problem does this solve?

Please add

minimax/minimax-m2.5
z-ai/glm-5

from OpenRouter to https://rubyllm.com/available-models/, as they are significant upgrades

Proposed solution

openrouter:minimax/minimax-m2.5
openrouter:z-ai/glm-5

should be added to model registry

Why this belongs in RubyLLM

Model registry is not managed by user

[darkBuddha]

and openrouter:qwen/qwen3.5-397b-a17b please 🙏🏻🙏🏻🙏🏻