add latest models

[svilupp]

Added

New models added:

• OpenAI: gpt-6-sol (gpt6, gpt6s), gpt-6.1-sol (gpt61, gpt61s), gpt-6-astra (gpt6a), and gpt-6-luna (gpt6l).
• Gemini: gemini-3.1-flash-lite (gem31fl), gemini-3.5-flash (gem35f), gemini-3.5-flash-lite (gem35fl), and gemini-3.6-flash (gem36f), gemini-3.7-flash (gem37f), and gemini-3.8-flash (gem38f); text embeddings gemini-embedding-001 (gememb1) and gemini-embedding-2 (gememb2, gememb).
• Claude: claude-opus-5 (claudeo5), claude-opus-5-5 (claudeo55), claude-sonnet-5-5 (claudes55), and claude-fable-5-1 (claudef51).

Fixed

• Google compatible endpoint URLs and model-specific cache prices, preserving explicit schema overrides.
• Default Claude extraction uses automatic tool selection on Sonnet 5.5, Opus 5.5, and Fable 5.1, which reject forced tool use.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.02%. Comparing base (f8dfc5e) to head (eb65f3d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #334      +/-   ##
==========================================
+ Coverage   92.93%   93.02%   +0.09%     
==========================================
  Files          40       40              
  Lines        3509     3514       +5     
==========================================
+ Hits         3261     3269       +8     
+ Misses        248      245       -3     

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