feat: complete analytics module self-containment

Migrate analytics module to fully self-contained structure:

- routes/api/vendor.py - API endpoints
- routes/pages/vendor.py - Page routes with full implementation
- services/stats_service.py - Business logic (moved from app/services)
- services/usage_service.py - Usage tracking (moved from app/services)
- schemas/stats.py - Pydantic schemas (moved from models/schema)
- models/__init__.py - Model exports
- templates/analytics/vendor/ - Templates (moved from app/templates)
- static/vendor/js/ - JavaScript (moved from static/vendor)
- locales/ - Translations (en, de, fr, lu)
- exceptions.py - Module exceptions

Removed legacy files:
- app/modules/analytics/routes/vendor.py (replaced by routes/pages/)
- static/admin/js/analytics.js (unused)

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

app/modules/analytics/definition.py

@@ -3,18 +3,25 @@
 Analytics module definition.
 
 Defines the analytics module including its features, menu items,
-and route configurations.
+route configurations, and self-contained module settings.
 """
 
 from app.modules.base import ModuleDefinition
 from models.database.admin_menu_config import FrontendType
 
 
-def _get_vendor_router():
-    """Lazy import of vendor router to avoid circular imports."""
-    from app.modules.analytics.routes.vendor import vendor_router
+def _get_vendor_api_router():
+    """Lazy import of vendor API router to avoid circular imports."""
+    from app.modules.analytics.routes.api.vendor import router
 
-    return vendor_router
+    return router
+
+
+def _get_vendor_page_router():
+    """Lazy import of vendor page router to avoid circular imports."""
+    from app.modules.analytics.routes.pages.vendor import router
+
+    return router
 
 
 # Analytics module definition
@@ -22,11 +29,13 @@ analytics_module = ModuleDefinition(
     code="analytics",
     name="Analytics & Reporting",
     description="Dashboard analytics, custom reports, and data exports.",
+    version="1.0.0",
     features=[
         "basic_reports",  # Basic reporting
         "analytics_dashboard",  # Analytics dashboard
         "custom_reports",  # Custom report builder
         "export_reports",  # Export to CSV/Excel
+        "usage_metrics",  # Usage and performance metrics
     ],
     menu_items={
         FrontendType.ADMIN: [
@@ -37,6 +46,18 @@ analytics_module = ModuleDefinition(
         ],
     },
     is_core=False,
+    # =========================================================================
+    # Self-Contained Module Configuration
+    # =========================================================================
+    is_self_contained=True,
+    services_path="app.modules.analytics.services",
+    models_path="app.modules.analytics.models",
+    schemas_path="app.modules.analytics.schemas",
+    exceptions_path="app.modules.analytics.exceptions",
+    # Module templates (namespaced as analytics/admin/*.html and analytics/vendor/*.html)
+    templates_path="templates",
+    # Module-specific translations (accessible via analytics.* keys)
+    locales_path="locales",
 )
 
 
@@ -46,8 +67,13 @@ def get_analytics_module_with_routers() -> ModuleDefinition:
 
     This function attaches the routers lazily to avoid circular imports
     during module initialization.
+
+    Routers:
+    - vendor_api_router: API endpoints for vendor analytics
+    - vendor_page_router: Page routes for vendor analytics dashboard
     """
-    analytics_module.vendor_router = _get_vendor_router()
+    analytics_module.vendor_api_router = _get_vendor_api_router()
+    analytics_module.vendor_page_router = _get_vendor_page_router()
     return analytics_module