chore(openrouter): remove deprecated and unavailable models

[tobwen]

Summary

Removes models from the openrouter provider that are no longer available. Fixes #1248

Removes models from the openrouter provider that are no longer available:

Models without endpoints (33 files)

• cognitivecomputations/dolphin3.0-mistral-24b
• cognitivecomputations/dolphin3.0-r1-mistral-24b
• deepseek/deepseek-r1-0528-qwen3-8b:free
• deepseek/deepseek-r1-0528:free
• deepseek/deepseek-r1-distill-qwen-14b
• deepseek/deepseek-r1:free
• deepseek/deepseek-v3-base:free
• featherless/qwerky-72b
• google/gemini-2.0-flash-exp:free
• meta-llama/llama-3.1-405b-instruct:free
• meta-llama/llama-4-scout:free
• microsoft/mai-ds-r1:free
• mistralai/devstral-small-2505:free
• mistralai/mistral-7b-instruct:free
• mistralai/mistral-nemo:free
• mistralai/mistral-small-3.2-24b-instruct:free
• moonshotai/kimi-dev-72b:free
• nousresearch/deephermes-3-llama-3-8b-preview
• qwen/qwen-2.5-vl-7b-instruct:free
• qwen/qwen2.5-vl-32b-instruct:free
• qwen/qwen2.5-vl-72b-instruct:free
• qwen/qwen3-14b:free
• qwen/qwen3-235b-a22b-07-25:free
• qwen/qwen3-235b-a22b:free
• qwen/qwen3-30b-a3b:free
• qwen/qwen3-32b:free
• qwen/qwen3-8b:free
• qwen/qwq-32b:free
• rekaai/reka-flash-3
• sarvamai/sarvam-m:free
• thudm/glm-z1-32b:free
• tngtech/deepseek-r1t2-chimera:free
• tngtech/tng-r1t-chimera:free

Expired/revealed/ended endpoints (8 files)

• allenai/molmo-2-8b:free (Free period ended)
• kwaipilot/kat-coder-pro:free (Free period ended)
• mistralai/devstral-2512:free (Free period ended)
• openrouter/aurora-alpha (Testing period ended)
• openrouter/healer-alpha (Revealed as MiMo-V2-Omni)
• openrouter/hunter-alpha (Revealed as MiMo-V2-Pro)
• openrouter/sherlock-dash-alpha (Revealed as Grok 4.1 Fast)
• openrouter/sherlock-think-alpha (Revealed as Grok 4.1 Fast)