Release v1.6.0 - Audit System Cross-Tenant Viewing

Features:
- ✅ Cross-tenant audit log viewing for ADMIN/SUPPORT_MANAGER
- ✅ New 'all_tenants' parameter in audit endpoints
- ✅ Frontend toggle to view all clients' logs
- ✅ Multi-tenant stats support in /audit/stats
- ✅ Fixed timezone issue with date filters (UTC consistency)
- ✅ Fixed date_to filter overlap causing duplicate records

Changes:
- backend/app/api/v1/endpoints/audit.py:
  * Added tenant_id and all_tenants query parameters
  * Permission checks for cross-tenant viewing
  * Dynamic tenant filtering based on user role
  * Fixed date_to filter (removed +1 day overlap)
  * Updated all stats queries for multi-tenant support

- frontend-internal/src/routes/audit/+page.svelte:
  * Import auth store for role detection
  * Added 'Ver todos los clientes' toggle for admins
  * Pass all_tenants parameter to API calls
  * UI badge indicating multi-tenant mode

- Version bump: 1.5.1.2 → 1.6.0 across all packages

frontend-client/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@servicemanager/client-frontend",
-  "version": "1.5.1.2",
+  "version": "1.6.0",
   "private": true,
   "type": "module",
   "scripts": {