remove unused enable_gemini_3_flash feature flag.

[shixiao-coder]

The enable_gemini_3_flash was fully migrated over 1 month ago and related legacy code removed 2 weeks ago, now removing the last pice (enable_gemini_3_flash flag) of the migration

[gemini-code-assist]

Summary of Changes

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This pull request completes the cleanup process for the 'enable_gemini_3_flash' feature flag. As the migration was finalized and legacy code was previously removed, this change eliminates the final configuration entries across all environments to maintain a clean codebase.

Highlights

• Feature Flag Cleanup: Removed the 'enable_gemini_3_flash' feature flag from all environment configuration files.

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[gemini-code-assist]

Code Review

This pull request removes the enable_gemini_3_flash feature flag from all environment configuration files, including autopush, custom, dev, local, production, and staging. No review comments were provided, and I have no feedback to offer.

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[gmechali]

Other than production.json, looks good

[github-actions]

⚠️ PRODUCTION FEATURE FLAG CHANGE — REVIEW CHECKLIST

Please conduct a careful review before merging this production change & coordinate with the oncaller.
Merging this PR will trigger a rolling restart of all Kubernetes pods in production.

Things to check before approving:

• Staging Validated: Have these exact flag changes been tested and verified in staging?
• Cache Invalidation: If API responses change, remember to clear the Redis cache after merging.
• Time Window: Ensure updates occur during global working hours; request lead approval for Friday–Sunday updates.
• Oncall Communication: Please additionally announce this update on the oncall thread.
• Type Safety: Verify that flag value types match what the server binary expects.

[dhotchkiss]

I really appreciate seeing the follow-through to clean up obsolete flags. Thank you Xiao!