feat(pos): register POS, customers, cash register blueprints and page routes

pos/app.py

@@ -16,6 +16,15 @@ def create_app():
     from blueprints.catalog_bp import catalog_bp
     app.register_blueprint(catalog_bp)
 
+    from blueprints.pos_bp import pos_bp
+    app.register_blueprint(pos_bp)
+
+    from blueprints.customers_bp import customers_bp
+    app.register_blueprint(customers_bp)
+
+    from blueprints.cashregister_bp import cashregister_bp
+    app.register_blueprint(cashregister_bp)
+
     # Health check
     @app.route('/pos/health')
     def health():
@@ -35,6 +44,14 @@ def create_app():
     def pos_inventory():
         return render_template('inventory.html')
 
+    @app.route('/pos/sale')
+    def pos_sale():
+        return render_template('pos.html')
+
+    @app.route('/pos/customers')
+    def pos_customers():
+        return render_template('customers.html')
+
     @app.route('/pos/static/<path:filename>')
     def pos_static(filename):
         return send_from_directory('static', filename)