Add mcp auth documentation
This PR adds documentation for authenticating MCP clients and servers using Dapr OAuth2 middleware components.
Azure Static Web Apps: Your stage site is ready! Visit it here: https://kind-hill-063ba6c1e-4972.westus2.5.azurestaticapps.net
Azure Static Web Apps: Your stage site is ready! Visit it here: https://green-bush-04c343a1e-4972.westus2.4.azurestaticapps.net
Azure Static Web Apps: Your stage site is ready! Visit it here: https://green-bush-04c343a1e-4972.westus2.4.azurestaticapps.net
Azure Static Web Apps: Your stage site is ready! Visit it here: https://kind-hill-063ba6c1e-4972.westus2.5.azurestaticapps.net
Azure Static Web Apps: Your stage site is ready! Visit it here: https://kind-hill-063ba6c1e-4972.westus2.5.azurestaticapps.net
Azure Static Web Apps: Your stage site is ready! Visit it here: https://green-bush-04c343a1e-4972.westus2.4.azurestaticapps.net
@yaron2 same comment for this one as in #4973