refactor: migrate templates and static files to self-contained modules

Templates Migration:
- Migrate admin templates to modules (tenancy, billing, monitoring, marketplace, etc.)
- Migrate vendor templates to modules (tenancy, billing, orders, messaging, etc.)
- Migrate storefront templates to modules (catalog, customers, orders, cart, checkout, cms)
- Migrate public templates to modules (billing, marketplace, cms)
- Keep shared templates in app/templates/ (base.html, errors/, partials/, macros/)
- Migrate letzshop partials to marketplace module

Static Files Migration:
- Migrate admin JS to modules: tenancy (23 files), core (5 files), monitoring (1 file)
- Migrate vendor JS to modules: tenancy (4 files), core (2 files)
- Migrate shared JS: vendor-selector.js to core, media-picker.js to cms
- Migrate storefront JS: storefront-layout.js to core
- Keep framework JS in static/ (api-client, utils, money, icons, log-config, lib/)
- Update all template references to use module_static paths

Naming Consistency:
- Rename static/platform/ to static/public/
- Rename app/templates/platform/ to app/templates/public/
- Update all extends and static references

Documentation:
- Update module-system.md with shared templates documentation
- Update frontend-structure.md with new module JS organization

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

app/modules/messaging/services/__init__.py

@@ -24,6 +24,46 @@ from app.modules.messaging.services.admin_notification_service import (
     AlertType,
     Severity,
 )
+from app.modules.messaging.services.email_service import (
+    EmailService,
+    EmailProvider,
+    ResolvedTemplate,
+    BrandingContext,
+    send_email,
+    get_provider,
+    get_platform_provider,
+    get_vendor_provider,
+    get_platform_email_config,
+    # Provider classes
+    SMTPProvider,
+    SendGridProvider,
+    MailgunProvider,
+    SESProvider,
+    DebugProvider,
+    # Configurable provider classes
+    ConfigurableSMTPProvider,
+    ConfigurableSendGridProvider,
+    ConfigurableMailgunProvider,
+    ConfigurableSESProvider,
+    # Vendor provider classes
+    VendorSMTPProvider,
+    VendorSendGridProvider,
+    VendorMailgunProvider,
+    VendorSESProvider,
+    # Constants
+    PLATFORM_NAME,
+    PLATFORM_SUPPORT_EMAIL,
+    PLATFORM_DEFAULT_LANGUAGE,
+    SUPPORTED_LANGUAGES,
+    WHITELABEL_TIERS,
+    POWERED_BY_FOOTER_HTML,
+    POWERED_BY_FOOTER_TEXT,
+)
+from app.modules.messaging.services.email_template_service import (
+    EmailTemplateService,
+    TemplateData,
+    VendorOverrideData,
+)
 
 __all__ = [
     "messaging_service",
@@ -39,4 +79,42 @@ __all__ = [
     "Priority",
     "AlertType",
     "Severity",
+    # Email service
+    "EmailService",
+    "EmailProvider",
+    "ResolvedTemplate",
+    "BrandingContext",
+    "send_email",
+    "get_provider",
+    "get_platform_provider",
+    "get_vendor_provider",
+    "get_platform_email_config",
+    # Provider classes
+    "SMTPProvider",
+    "SendGridProvider",
+    "MailgunProvider",
+    "SESProvider",
+    "DebugProvider",
+    # Configurable provider classes
+    "ConfigurableSMTPProvider",
+    "ConfigurableSendGridProvider",
+    "ConfigurableMailgunProvider",
+    "ConfigurableSESProvider",
+    # Vendor provider classes
+    "VendorSMTPProvider",
+    "VendorSendGridProvider",
+    "VendorMailgunProvider",
+    "VendorSESProvider",
+    # Email constants
+    "PLATFORM_NAME",
+    "PLATFORM_SUPPORT_EMAIL",
+    "PLATFORM_DEFAULT_LANGUAGE",
+    "SUPPORTED_LANGUAGES",
+    "WHITELABEL_TIERS",
+    "POWERED_BY_FOOTER_HTML",
+    "POWERED_BY_FOOTER_TEXT",
+    # Email template service
+    "EmailTemplateService",
+    "TemplateData",
+    "VendorOverrideData",
 ]