feat(auth): block disabled user accounts at the subscription guard

RequireActiveTenantSubscription now optionally takes an AuthRepository
and rejects the request with 40311/user_disabled when the actor's user
row is anything other than active. Wire the repo through the tenant
router, surface the new error code in admin-web's
membershipBlockedErrors set, persist a "disabled" membership status when
markStoredMembershipBlocked sees user_disabled, and add localized copy
on the blocked screen and shell membership banner.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/internal/tenant/transport/router.go

@@ -65,7 +65,10 @@ func RegisterRoutes(app *bootstrap.App) {
 	desktopAuth.POST("/monitoring/tasks/:id/cancel", desktopMonitoringHandler.Cancel)
 
 	tenantProtected := protected.Group("/tenant")
-	tenantProtected.Use(RequireActiveTenantSubscription(repository.NewTenantPlanRepository(app.DB)))
+	tenantProtected.Use(RequireActiveTenantSubscription(
+		repository.NewTenantPlanRepository(app.DB),
+		repository.NewAuthRepository(app.DB),
+	))
 	tenantProtected.GET("/accounts", desktopAccountHandler.TenantList)
 	tenantProtected.POST("/accounts/:id/request-delete", desktopAccountHandler.RequestDelete)
 	tenantProtected.POST("/tasks/:id/reconcile", desktopTaskHandler.Reconcile)

server/internal/tenant/transport/subscription_guard.go

@@ -1,16 +1,22 @@
 package transport
 
 import (
+	"errors"
+	"strings"
 	"time"
 
 	"github.com/gin-gonic/gin"
+	"github.com/jackc/pgx/v5"
 
 	"github.com/geo-platform/tenant-api/internal/shared/auth"
 	"github.com/geo-platform/tenant-api/internal/shared/response"
 	"github.com/geo-platform/tenant-api/internal/tenant/repository"
 )
 
-func RequireActiveTenantSubscription(plans repository.TenantPlanRepository) gin.HandlerFunc {
+func RequireActiveTenantSubscription(
+	plans repository.TenantPlanRepository,
+	authRepos ...repository.AuthRepository,
+) gin.HandlerFunc {
 	return func(c *gin.Context) {
 		actor, ok := auth.ActorFromCtx(c.Request.Context())
 		if !ok {
@@ -19,6 +25,28 @@ func RequireActiveTenantSubscription(plans repository.TenantPlanRepository) gin.
 			return
 		}
 
+		if len(authRepos) > 0 && authRepos[0] != nil {
+			user, err := authRepos[0].GetUserByID(c.Request.Context(), actor.UserID)
+			if err != nil {
+				if errors.Is(err, pgx.ErrNoRows) {
+					response.Error(c, response.ErrNotFound(40401, "user_not_found", "user not found"))
+				} else {
+					response.Error(c, response.ErrInternal(50092, "user_lookup_failed", "failed to load user"))
+				}
+				c.Abort()
+				return
+			}
+			if !strings.EqualFold(strings.TrimSpace(user.Status), "active") {
+				response.Error(c, response.ErrForbidden(
+					40311,
+					"user_disabled",
+					"user account is disabled, please contact support",
+				))
+				c.Abort()
+				return
+			}
+		}
+
 		now := time.Now().UTC()
 		access, err := plans.GetTenantPlanAccess(c.Request.Context(), actor.TenantID, now)
 		if err != nil {