Rename plugins to automations and fix scheduler/payment bugs

Major changes:
- Rename "plugins" to "automations" throughout codebase
- Move automation system to dedicated app (scheduling/automations/)
- Add new automation marketplace, creation, and management pages

Bug fixes:
- Fix payment endpoint 500 errors (use has_feature() instead of attribute)
- Fix scheduler showing "0 AM" instead of "12 AM"
- Fix scheduler business hours double-inversion display issue
- Fix scheduler scroll-to-current-time when switching views
- Fix week view centering on wrong day (use Sunday-based indexing)
- Fix capacity widget overflow with many resources
- Fix Recharts minWidth/minHeight console warnings

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

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

frontend/src/components/Sidebar.tsx

@@ -130,7 +130,7 @@ const Sidebar: React.FC<SidebarProps> = ({ business, user, isCollapsed, toggleCo
               icon={Clock}
               label={t('nav.tasks', 'Tasks')}
               isCollapsed={isCollapsed}
-              locked={!canUse('plugins') || !canUse('tasks')}
+              locked={!canUse('automations') || !canUse('tasks')}
               badgeElement={<UnfinishedBadge />}
             />
           )}
@@ -257,15 +257,15 @@ const Sidebar: React.FC<SidebarProps> = ({ business, user, isCollapsed, toggleCo
           </SidebarSection>
         )}
 
-        {/* Extend Section - Plugins */}
+        {/* Extend Section - Automations */}
         {canViewAdminPages && (
           <SidebarSection title={t('nav.sections.extend', 'Extend')} isCollapsed={isCollapsed}>
             <SidebarItem
-              to="/dashboard/plugins/my-plugins"
+              to="/dashboard/automations/my-automations"
               icon={Plug}
-              label={t('nav.plugins', 'Plugins')}
+              label={t('nav.automations', 'Automations')}
               isCollapsed={isCollapsed}
-              locked={!canUse('plugins')}
+              locked={!canUse('automations')}
               badgeElement={<UnfinishedBadge />}
             />
           </SidebarSection>