docs: add Codex AI tool guide

[AmanVarshney01]

Summary

Adds Codex to the Prisma AI tools docs.

Changes

• Add a new /ai/tools/codex guide for installing the Prisma Codex plugin.
• Document that the plugin includes Prisma ORM skills plus the remote Prisma MCP server.
• Add Codex to the AI tools nav and /ai overview page.
• Add Codex setup instructions to the MCP server integration guide.

Validation

• pnpm --filter docs types:check
• pnpm --filter docs lint:links
• pnpm --filter docs lint:spellcheck
• pnpm exec oxfmt --check apps/docs/content/docs/ai/index.mdx apps/docs/content/docs/ai/tools/codex.mdx apps/docs/content/docs/ai/tools/mcp-server.mdx apps/docs/content/docs/ai/tools/meta.json

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Project	Deployment	Actions	Updated (UTC)
blog	Ready	Preview, Comment	May 4, 2026 8:53pm
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site	Ready	Preview, Comment	May 4, 2026 8:53pm

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	May 4, 2026, 8:59 PM