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/FloatingHelpButton.tsx

@@ -27,10 +27,10 @@ const routeToHelpPath: Record<string, string> = {
   '/payments': '/help/payments',
   '/contracts': '/help/contracts',
   '/contracts/templates': '/help/contracts',
-  '/plugins': '/help/plugins',
-  '/plugins/marketplace': '/help/plugins',
-  '/plugins/my-plugins': '/help/plugins',
-  '/plugins/create': '/help/plugins/docs',
+  '/automations': '/help/automations',
+  '/automations/marketplace': '/help/automations',
+  '/automations/my-automations': '/help/automations',
+  '/automations/create': '/help/automations/docs',
   '/settings': '/help/settings/general',
   '/settings/general': '/help/settings/general',
   '/settings/resource-types': '/help/settings/resource-types',