Phase 4: Webhooks, Backup/Restore UI, Onboarding/Tutorial

- Webhooks Backend: model, schema, service (HMAC-SHA256, httpx), routes, event bus dispatcher, migration 0042
- Webhooks Frontend: SettingsWebhooksPage (CRUD, test button, event multi-select), API client
- Backup/Restore Backend: model, schema, service (pg_dump/pg_restore), routes (admin-only), migration 0043
- Backup/Restore Frontend: SettingsBackupPage (create, list, restore dialog with RESTORE confirmation, auto-refresh)
- Onboarding: OnboardingTour (8 steps, custom CSS overlay), WelcomeDialog, onboardingStore (zustand + localStorage)
- Onboarding integrated into AppShell
- Routes: /settings/webhooks, /settings/backup registered
- Settings nav: Webhooks, Backup & Restore entries added
- Migration conflict fixed: 0042_webhooks → 0043_backups chain

app/main.py

@@ -52,6 +52,8 @@ from app.routes import (
     custom_field_definitions,
     custom_fields,
     saved_filters,
+    webhooks,
+    backups,
 )
 
 
@@ -331,9 +333,11 @@ def create_app() -> FastAPI:
     app.include_router(addresses.router)
     app.include_router(bank_accounts.router)
     app.include_router(audit.router)
+    app.include_router(backups.router)
     app.include_router(custom_field_definitions.router)
     app.include_router(custom_fields.router)
     app.include_router(saved_filters.router)
+    app.include_router(webhooks.router)
 
     # ── Register plugin routes for all built-in plugins ──
     # Routes are registered here (before app start); activation status