fix(proxy): support slashes in google generateContent model names#19737

3 commits merged intoBerriAI:litellm_oss_staging_01_26_2026BerriAI/litellm:litellm_oss_staging_01_26_2026from

jayy-77:fix/issue-19635-generatecontent-model-slashjayy-77/litellm:fix/issue-19635-generatecontent-model-slashCopy head branch name to clipboard