Add Stripe notifications, messaging improvements, and code cleanup

Stripe Notifications:
- Add periodic task to check Stripe Connect accounts for requirements
- Create in-app notifications for business owners when action needed
- Add management command to setup Stripe periodic tasks
- Display Stripe notifications with credit card icon in notification bell
- Navigate to payments page when Stripe notification clicked

Messaging Improvements:
- Add "Everyone" option to broadcast message recipients
- Allow sending messages to yourself (remove self-exclusion)
- Fix broadcast message ID not returned after creation
- Add real-time websocket support for broadcast notifications
- Show toast when broadcast message received via websocket

UI Fixes:
- Remove "View all" button from notifications (no page exists)
- Add StripeNotificationBanner component for Connect alerts
- Connect useUserNotifications hook in TopBar for app-wide websocket

Code Cleanup:
- Remove legacy automations app and plugin system
- Remove safe_scripting module (moved to Activepieces)
- Add migration to remove plugin-related models
- Various test improvements and coverage additions

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/components/NotificationDropdown.tsx

@@ -1,7 +1,7 @@
 import React, { useState, useRef, useEffect } from 'react';
 import { useTranslation } from 'react-i18next';
 import { useNavigate } from 'react-router-dom';
-import { Bell, Check, CheckCheck, Trash2, X, Ticket, Calendar, MessageSquare, Clock } from 'lucide-react';
+import { Bell, Check, CheckCheck, Trash2, X, Ticket, Calendar, MessageSquare, Clock, CreditCard } from 'lucide-react';
 import {
   useNotifications,
   useUnreadNotificationCount,
@@ -64,6 +64,13 @@ const NotificationDropdown: React.FC<NotificationDropdownProps> = ({ variant = '
       return;
     }
 
+    // Handle Stripe requirements notifications - navigate to payments page
+    if (notification.data?.type === 'stripe_requirements') {
+      navigate('/dashboard/payments');
+      setIsOpen(false);
+      return;
+    }
+
     // Navigate to target if available
     if (notification.target_url) {
       navigate(notification.target_url);
@@ -85,6 +92,11 @@ const NotificationDropdown: React.FC<NotificationDropdownProps> = ({ variant = '
       return <Clock size={16} className="text-amber-500" />;
     }
 
+    // Check for Stripe requirements notifications
+    if (notification.data?.type === 'stripe_requirements') {
+      return <CreditCard size={16} className="text-purple-500" />;
+    }
+
     switch (notification.target_type) {
       case 'ticket':
         return <Ticket size={16} className="text-blue-500" />;
@@ -192,9 +204,9 @@ const NotificationDropdown: React.FC<NotificationDropdownProps> = ({ variant = '
                           {' '}
                           {notification.verb}
                         </p>
-                        {notification.target_display && (
+                        {(notification.target_display || notification.data?.description) && (
                           <p className="text-sm text-gray-500 dark:text-gray-400 truncate mt-0.5">
-                            {notification.target_display}
+                            {notification.target_display || notification.data?.description}
                           </p>
                         )}
                         <p className="text-xs text-gray-400 dark:text-gray-500 mt-1">
@@ -213,7 +225,7 @@ const NotificationDropdown: React.FC<NotificationDropdownProps> = ({ variant = '
 
           {/* Footer */}
           {notifications.length > 0 && (
-            <div className="px-4 py-3 border-t border-gray-200 dark:border-gray-700 flex items-center justify-between">
+            <div className="px-4 py-3 border-t border-gray-200 dark:border-gray-700 flex items-center justify-center">
               <button
                 onClick={handleClearAll}
                 disabled={clearAllMutation.isPending}
@@ -222,15 +234,6 @@ const NotificationDropdown: React.FC<NotificationDropdownProps> = ({ variant = '
                 <Trash2 size={12} />
                 {t('notifications.clearRead', 'Clear read')}
               </button>
-              <button
-                onClick={() => {
-                  navigate('/dashboard/notifications');
-                  setIsOpen(false);
-                }}
-                className="text-xs text-brand-600 hover:text-brand-700 dark:text-brand-400 font-medium"
-              >
-                {t('notifications.viewAll', 'View all')}
-              </button>
             </div>
           )}
         </div>