Relax CORS policy for template servers

[MiguelsPizza]

Update both React and Vanilla template servers to use the most permissive CORS policy possible to enable embedding anywhere:

• Allow all origins (origin: '*')
• Allow all headers (allowHeaders: ['*'])
• Allow all HTTP methods (allowMethods: ['*'])
• Expose all headers to clients (exposeHeaders: ['*'])
• Enable credentials support (credentials: true)
• Cache preflight requests for 24 hours (maxAge: 86400)

This ensures maximum compatibility when embedding these servers in iframes, third-party sites, or any other context.

Description

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test addition/improvement

Related Issues

Fixes #
Related to #

Changes Made

• Change 1
• Change 2
• Change 3

Testing

Test Commands Run

pnpm typecheck  # ✓ Passed
pnpm lint       # ✓ Passed
pnpm build      # ✓ Passed
pnpm test       # ✓ Passed - E2E tests run locally

Manual Testing

• Tested in development mode (pnpm dev)
• Tested production build (pnpm build && preview)
• Tested on mobile/tablet (if UI changes)
• Tested WebMCP integration (if applicable)
• Tested MCP tool execution (if applicable)

Screenshots

Checklist

• My code follows the style guidelines in CONTRIBUTING.md
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings or errors
• I have added tests that prove my fix is effective or that my feature works
• I have run E2E tests locally (pnpm test) and they pass
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published

Breaking Changes

None

Additional Notes

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	mcp-ui-with-webmcp-my-mcp-server	62afabe	Nov 23 2025, 12:28 AM