Fix/multitenancy aspnetcore

[mheidari988]

Summary

• Fix minimal API OpenAPI route detection by falling back to endpoint metadata and display names so {tenantId} stays in Swagger paths, with regression tests.
• Switch the multitenancy sample to local project references and refresh the generated OpenAPI spec to reflect tenant routes.

Testing

• dotnet test
• Other (add details):

Checklist

• Includes docs/changelog updates if user-facing
• Adds/updates tests
• Keeps public API surface minimal and backward compatible (or documents breaking change)
• PR scoped to a single concern/module where possible

Notes

• Breaking changes? If yes, describe impact and migration.
  • None.
• Related issues/links:
  • N/A