feat(oauthserver): add OAuth client admin update endpoint

[cemalkilic]

Summary

Adds a new admin endpoint to update existing OAuth client configurations. This enables administrators to modify OAuth client settings without having to delete and recreate clients.

Changes

New Endpoint

• PUT /admin/oauth/clients/{client_id} - Update OAuth client configuration (admin only)

Supported Update Fields

• redirect_uris - Array of redirect URIs
• grant_types - Array of grant types (authorization_code, refresh_token)
• client_name - Human-readable client name
• client_uri - Client application homepage URL
• logo_uri - Client application logo URL

Example Usage

# Update client redirect URIs and name
curl -X PUT https://your-project.supabase.co/admin/oauth/clients/{client_id} \
  -H "Authorization: Bearer {admin-token}" \
  -H "Content-Type: application/json" \
  -d '{
    "client_name": "Updated App Name",
    "redirect_uris": ["https://app.example.com/callback"]
  }'

[coveralls]

Pull Request Test Coverage Report for Build 18932046775

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 120 of 143 (83.92%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.09%) to 68.101%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/api/oauthserver/handlers.go	16	19	84.21%
internal/api/oauthserver/service.go	103	123	83.74%

Totals
Change from base Build 18910658377:	0.09%
Covered Lines:	13883
Relevant Lines:	20386

---

💛 - Coveralls