Update ToolHive reference docs for v0.0.46 (#13)

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Author: github-actions[bot]

docs/toolhive/reference/cli/thv_proxy.md

@@ -61,6 +61,7 @@ thv proxy [flags] SERVER_NAME
       --oidc-jwks-url string                    URL to fetch the JWKS from
       --port int                                Port for the HTTP proxy to listen on (host port)
       --remote-auth                             Enable OAuth authentication to remote MCP server
+      --remote-auth-callback-port int           Port for OAuth callback server during remote authentication (default: 8666) (default 8666)
       --remote-auth-client-id string            OAuth client ID for remote server authentication
       --remote-auth-client-secret string        OAuth client secret for remote server authentication (optional for PKCE)
       --remote-auth-client-secret-file string   Path to file containing OAuth client secret (alternative to --remote-auth-client-secret)