[management, infrastructure, idp] Simplified IdP Management - Embedded IdP (#5008)

Embed Dex as a built-in IdP to simplify self-hosting setup.
Adds an embedded OIDC Identity Provider (Dex) with local user management and optional external IdP connectors (Google/GitHub/OIDC/SAML), plus device-auth flow for CLI login. Introduces instance onboarding/setup endpoints (including owner creation), field-level encryption for sensitive user data, a streamlined self-hosting provisioning script, and expanded APIs + test coverage for IdP management.

more at https://github.com/netbirdio/netbird/pull/5008#issuecomment-3718987393

management/server/http/handlers/users/users_handler.go

@@ -326,6 +326,16 @@ func toUserResponse(user *types.UserInfo, currenUserID string) *api.User {
 
 	isCurrent := user.ID == currenUserID
 
+	var password *string
+	if user.Password != "" {
+		password = &user.Password
+	}
+
+	var idpID *string
+	if user.IdPID != "" {
+		idpID = &user.IdPID
+	}
+
 	return &api.User{
 		Id:              user.ID,
 		Name:            user.Name,
@@ -339,6 +349,8 @@ func toUserResponse(user *types.UserInfo, currenUserID string) *api.User {
 		LastLogin:       &user.LastLogin,
 		Issued:          &user.Issued,
 		PendingApproval: user.PendingApproval,
+		Password:        password,
+		IdpId:           idpID,
 	}
 }