Add SEO data generation and testing for bilingual pages

- Implemented SEO data structures for programmatic tool and collection pages.
- Created functions to build FAQs and content sections for SEO pages.
- Added tests to ensure at least 50 bilingual SEO pages are generated, no duplicate English slugs, and matching Arabic localized paths.
- Verified that both tool and collection SEO inventories are populated adequately.

backend/app/__init__.py

@@ -159,6 +159,7 @@ def create_app(config_name=None):
     from app.routes.pdf_extra import pdf_extra_bp
     from app.routes.image_extra import image_extra_bp
     from app.routes.barcode import barcode_bp
+    from app.routes.sitemap import sitemap_bp
 
     app.register_blueprint(health_bp, url_prefix="/api")
     app.register_blueprint(auth_bp, url_prefix="/api/auth")
@@ -192,5 +193,6 @@ def create_app(config_name=None):
     app.register_blueprint(pdf_extra_bp, url_prefix="/api/pdf-tools")
     app.register_blueprint(image_extra_bp, url_prefix="/api/image")
     app.register_blueprint(barcode_bp, url_prefix="/api/barcode")
+    app.register_blueprint(sitemap_bp)
 
     return app