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/test-results/.last-run.json

@@ -1,7 +1,4 @@
 {
-  "status": "failed",
-  "failedTests": [
-    "6f1a4b04e7ad1ff99f24-d68c404526a42bfecb67",
-    "6f1a4b04e7ad1ff99f24-6b3beabbc695cf50d356"
-  ]
+  "status": "passed",
+  "failedTests": []
 }