docs: document AI Gateway cost controls (#27643)

### Description

Adds documentation for AI Governance Cost Control, including how
administrators configure budgets, how effective groups are resolved, how
enforcement works, and where spend reporting is available.

### Changes

- Replace the placeholder cost control page with a full admin guide
- Document deployment settings, group budgets, user overrides, and
effective group resolution
- Explain estimated spend, unpriced models, notifications, enforcement,
and spend reporting
- Add migration guidance for Coder Agents Cost Control
- Add screenshots for group budgets and user overrides

Closes
[AIGOV-476](https://linear.app/codercom/issue/AIGOV-476/add-documentation-for-ai-bridge-cost-controls).

> [!NOTE]
> Initially generated by Coder Agents, modified and reviewed by
@ssncferreira
This commit is contained in:
Susana Ferreira
2026-07-30 15:04:39 +00:00
committed by GitHub
parent 7b104b6a98
commit 3f1973f45c
4 changed files with 307 additions and 8 deletions
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