feat(routing): add local model routing strategies

[vvv214]

Summary

• wire llm_routing into the current QwenPaw runtime path
• add deterministic local/cloud routing for structured output, non-text user content, required tools, and recent tool context
• make multimodal prompt/message handling routing-aware so media is preserved for cloud-bound requests

Validation

• python3 -m compileall src/qwenpaw/agents/model_factory.py src/qwenpaw/agents/routing_chat_model.py src/qwenpaw/agents/prompt.py

Split out from #3443 so routing/runtime changes can be reviewed separately from the Settings UI.

[github-actions]

Welcome to QwenPaw! 🐾

Hi @vvv214, this is your 6th Pull Request.

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