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/routes/pages/__init__.py

@@ -0,0 +1,13 @@
+# app/modules/analytics/routes/pages/__init__.py
+"""
+Analytics module page routes.
+
+Provides HTML page endpoints for analytics views:
+- Vendor pages: Analytics dashboard for vendors
+"""
+
+from app.modules.analytics.routes.pages.vendor import router as vendor_router
+
+# Note: Analytics has no admin pages - admin uses the main dashboard
+
+__all__ = ["vendor_router"]

app/modules/analytics/routes/pages/vendor.py

@@ -0,0 +1,90 @@
+# app/modules/analytics/routes/pages/vendor.py
+"""
+Analytics Vendor Page Routes (HTML rendering).
+
+Vendor pages for analytics dashboard.
+"""
+
+import logging
+
+from fastapi import APIRouter, Depends, Path, Request
+from fastapi.responses import HTMLResponse
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_current_vendor_from_cookie_or_header, get_db
+from app.services.platform_settings_service import platform_settings_service
+from app.templates_config import templates
+from models.database.user import User
+from models.database.vendor import Vendor
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter()
+
+
+# ============================================================================
+# HELPER: Build Vendor Dashboard Context
+# ============================================================================
+
+
+def get_vendor_context(
+    request: Request,
+    db: Session,
+    current_user: User,
+    vendor_code: str,
+    **extra_context,
+) -> dict:
+    """
+    Build template context for vendor dashboard pages.
+
+    Resolves locale/currency using the platform settings service with
+    vendor override support.
+    """
+    # Load vendor from database
+    vendor = db.query(Vendor).filter(Vendor.subdomain == vendor_code).first()
+
+    # Get platform defaults
+    platform_config = platform_settings_service.get_storefront_config(db)
+
+    # Resolve with vendor override
+    storefront_locale = platform_config["locale"]
+    storefront_currency = platform_config["currency"]
+
+    if vendor and vendor.storefront_locale:
+        storefront_locale = vendor.storefront_locale
+
+    context = {
+        "request": request,
+        "user": current_user,
+        "vendor": vendor,
+        "vendor_code": vendor_code,
+        "storefront_locale": storefront_locale,
+        "storefront_currency": storefront_currency,
+        **extra_context,
+    }
+
+    return context
+
+
+# ============================================================================
+# ANALYTICS PAGE
+# ============================================================================
+
+
+@router.get(
+    "/{vendor_code}/analytics", response_class=HTMLResponse, include_in_schema=False
+)
+async def vendor_analytics_page(
+    request: Request,
+    vendor_code: str = Path(..., description="Vendor code"),
+    current_user: User = Depends(get_current_vendor_from_cookie_or_header),
+    db: Session = Depends(get_db),
+):
+    """
+    Render analytics and reports page.
+    JavaScript loads analytics data via API.
+    """
+    return templates.TemplateResponse(
+        "analytics/vendor/analytics.html",
+        get_vendor_context(request, db, current_user, vendor_code),
+    )