fix(app): support API auth prompts in provider connect dialog

[PerceivingAI]

Issue for this PR

Fixes#30033

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

The desktop provider connect dialog ignored prompts on API auth methods, so Cloudflare Workers AI only asked for an API key and never collected the required Account ID.

This renders API auth prompts in the same form as the API key, saves those prompt values as auth metadata, and updates the Cloudflare Workers AI copy/Account ID placeholder.

How did you verify your code works?

• bun run --cwd packages/app typecheck
• git diff --check

Screenshots / recordings

Before:

After:

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

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[github-actions]

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