refactor: Reorganize Django apps into domain-based structure

Restructured 13 Django apps from flat/mixed organization into 5 logical
domain packages following cookiecutter-django conventions:

- identity/: core (tenant/domain models, middleware, mixins), users
- scheduling/: schedule, contracts, analytics
- communication/: notifications, credits, mobile, messaging
- commerce/: payments, tickets
- platform/: admin, api

Key changes:
- Moved all apps to smoothschedule/smoothschedule/{domain}/{app}/
- Updated all import paths across the codebase
- Updated settings (base.py, multitenancy.py, test.py)
- Updated URL configuration in config/urls.py
- Updated middleware and permission paths
- Preserved app_label in AppConfig for migration compatibility
- Updated CLAUDE.md documentation with new structure

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

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

smoothschedule/config/settings/multitenancy.py

@@ -13,10 +13,16 @@ from .base import INSTALLED_APPS, MIDDLEWARE, DATABASES, LOGGING, env
 # Shared apps - Available to all tenants (stored in 'public' schema)
 SHARED_APPS = [
     'django_tenants',  # Must be first
-    'core',  # Core models (Tenant, Domain, PermissionGrant)
-    'platform_admin.apps.PlatformAdminConfig',  # Platform management (TenantInvitation, etc.)
 
-    # Django built-ins (must be in shared
+    # Identity Domain (shared)
+    'smoothschedule.identity.core',  # Core models (Tenant, Domain, PermissionGrant)
+    'smoothschedule.identity.users',  # Users app (shared across tenants)
+
+    # Platform Domain (shared)
+    'smoothschedule.platform.admin',  # Platform management (TenantInvitation, etc.)
+    'smoothschedule.platform.api',  # Public API v1 for third-party integrations
+
+    # Django built-ins (must be in shared)
     'django.contrib.contenttypes',
     'django.contrib.auth',
     'django.contrib.sessions',
@@ -25,15 +31,12 @@ SHARED_APPS = [
     'django.contrib.staticfiles',
     'django.contrib.admin',
 
-    # Users app (shared across tenants)
-    'smoothschedule.users',
-
     # Third-party apps that should be shared
     'rest_framework',
     'rest_framework.authtoken',
     'corsheaders',
     'drf_spectacular',
-    'channels', # WebSockets
+    'channels',  # WebSockets
     'allauth',
     'allauth.account',
     'allauth.mfa',
@@ -45,23 +48,26 @@ SHARED_APPS = [
     'crispy_bootstrap5',
     'csp',
     'djstripe',  # Stripe integration
-    'tickets', # Ticket system - shared for platform support access
-    'notifications', # Notification system - shared for platform to notify tenants
-    'smoothschedule.public_api', # Public API v1 for third-party integrations
-    'smoothschedule.comms_credits', # Communication credits (SMS/calling) - shared for billing
-    'smoothschedule.field_mobile', # Field employee mobile app - shared for location tracking
+
+    # Commerce Domain (shared for platform support)
+    'smoothschedule.commerce.tickets',  # Ticket system - shared for platform support access
+
+    # Communication Domain (shared)
+    'smoothschedule.communication.notifications',  # Notification system - shared for platform
+    'smoothschedule.communication.credits',  # Communication credits (SMS/calling) - shared for billing
+    'smoothschedule.communication.mobile',  # Field employee mobile app - shared for location tracking
 ]
 
 # Tenant-specific apps - Each tenant gets isolated data in their own schema
 TENANT_APPS = [
     'django.contrib.contenttypes',  # Needed for tenant schemas
-    'schedule',  # Resource scheduling with configurable concurrency
-    'payments',  # Stripe Connect payments bridge
-    'contracts',  # Contract/e-signature system
-    # Add your tenant-scoped business logic apps here:
-    # 'appointments',
-    # 'customers',
-    # 'analytics',
+
+    # Scheduling Domain (tenant-isolated)
+    'smoothschedule.scheduling.schedule',  # Resource scheduling with configurable concurrency
+    'smoothschedule.scheduling.contracts',  # Contract/e-signature system
+
+    # Commerce Domain (tenant-isolated)
+    'smoothschedule.commerce.payments',  # Stripe Connect payments bridge
 ]
 
 
@@ -96,7 +102,7 @@ MIDDLEWARE = [
 
     # 1. Tenant resolution
     'django_tenants.middleware.main.TenantMainMiddleware',
-    'core.middleware.TenantHeaderMiddleware', # Support tenant switching via header
+    'smoothschedule.identity.core.middleware.TenantHeaderMiddleware', # Support tenant switching via header
 
     # 2. Security middleware
     'django.middleware.security.SecurityMiddleware',
@@ -108,7 +114,7 @@ MIDDLEWARE = [
 
     # 4. Sandbox mode - switches to sandbox schema if requested
     # MUST come after TenantMainMiddleware and SessionMiddleware
-    'core.middleware.SandboxModeMiddleware',
+    'smoothschedule.identity.core.middleware.SandboxModeMiddleware',
     'django.middleware.locale.LocaleMiddleware',
     'django.middleware.common.CommonMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
@@ -120,7 +126,7 @@ MIDDLEWARE = [
     'hijack.middleware.HijackUserMiddleware',
     
     # 6. MASQUERADE AUDIT - MUST come AFTER HijackUserMiddleware
-    'core.middleware.MasqueradeAuditMiddleware',
+    'smoothschedule.identity.core.middleware.MasqueradeAuditMiddleware',
     
     # 7. Messages, Clickjacking, and Allauth
     'django.contrib.messages.middleware.MessageMiddleware',
@@ -176,7 +182,7 @@ AUTH_PASSWORD_VALIDATORS = [
 # HIJACK (MASQUERADING) CONFIGURATION
 # =============================================================================
 
-HIJACK_AUTHORIZATION_CHECK = 'core.permissions.can_hijack'
+HIJACK_AUTHORIZATION_CHECK = 'smoothschedule.identity.core.permissions.can_hijack'
 HIJACK_DISPLAY_ADMIN_BUTTON = True
 HIJACK_USE_BOOTSTRAP = True
 HIJACK_ALLOW_GET_REQUESTS = False  # Security: require POST