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fix: update Ask AI model (#52736)

OpenAI is retiring the pinned GPT-4o mini snapshot on January 14, 2027,
but "Ask AI" on our site(s) still uses it.

This PR replaces it with GPT-6 Luna at low reasoning, which is a
similarly cost effective model. Its completion budget is increased to
allow room for reasoning, while the total cap preserves the previous
input allowance.

I noticed the `packages/ai-commands` where this was defined also
includes dead code from older versions of SQL and cron helpers, so this
also removes them for housekeeping.

I also upgraded the OpenAI SDK to support types for the new model.

To test, try asking a question in "Ask AI" in the docs
[preview](https://github.com/supabase/supabase/pull/52736#issuecomment-6618563374)
build:

<img width="568" height="583" alt="CleanShot 2026-11-03 at 7 22 29
PM@2x"
src="https://github.com/user-attachments/assets/fe8f824f-3884-44b8-affd-5710343e0101"
/>

Note the "Rename with Supabase AI" feature doesn't work but that's an
existing issue not related to this PR:
https://github.com/supabase/supabase/issues/51438

**References**

- https://developers.openai.com/api/docs/deprecations
- https://developers.openai.com/api/docs/models/gpt-6-luna

Closes AI-1397

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