feat(credentials): Add support for Anthropic credentials

[Ayush8923]

Issue

Closes #242

Summary

• Added support for Anthropic credentials.

Checklist

Before submitting a pull request, please ensure that you mark these task.

• Ran npm run dev and npm run build in the repository root and test.
• If you've fixed a bug or added code that is tested

[coderabbitai]

📝 Walkthrough

Walkthrough

Added a new anthropic provider entry to the PROVIDERS list in app/lib/types/credentials.ts, including display metadata and a password-type api_key credential field with placeholder text, inserted before the existing elevenlabs provider.

Changes

Anthropic Provider Configuration

Layer / File(s)	Summary
Add anthropic provider entry app/lib/types/credentials.ts	New anthropic object added to PROVIDERS array with id, name, description, credentialKey, and an api_key password field (placeholder sk-ant-xxxxx).

Estimated code review effort: 1 (Trivial) | ~3 minutes

Related issues: #242 - Enables the frontend to accept an Anthropic API key by adding the corresponding provider configuration.

Suggested labels: enhancement, frontend

Suggested reviewers: (none identified from provided context)

🐰 A whisker twitch, a new key in tow,
Anthropic joins the credentials row,
Password hidden, placeholder bright,
sk-ant-xxxxx, tucked in just right,
Hop along, one more provider to know!

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The API key field and password handling are added, but there is no evidence of the required API key format validation [#242].	Add Anthropic API key format validation in the credentials flow and verify storage/security behavior still meets #242.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Out of Scope Changes check	✅ Passed	The change stays focused on Anthropic credentials and does not दिख evidence of unrelated modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: adding Anthropic credential support in the credentials types.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/added-antropic-credentials

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@app/lib/types/credentials.ts`:
- Around line 76-89: The Anthropic credential entry in the ProviderDef list is
structurally fine, but it still lacks the required API key format validation.
Extend FieldDef in credentials.ts with an optional validation hook such as
pattern or validate, then update the credentials form flow that consumes
FieldDef to enforce the Anthropic api_key format (for example the sk-ant-
prefix) before saving. Use the existing Anthropic provider entry and the
credentials page/form logic as the integration points.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: fb91bc6b-d242-48ff-8b99-139af20b43a2

📥 Commits

Reviewing files that changed from the base of the PR and between 0829826 and e4f1111.

📒 Files selected for processing (1)

• app/lib/types/credentials.ts

[github-actions]

🎉 This PR is included in version 0.3.0-main.10 🎉

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