Remove duplicate listProducts service and add WebFacadeStub for MCP integration

- Removed duplicate listProducts service from McpServices.xml as it was causing conflicts
- Added WebFacadeStub.groovy to support web functionality in MCP context
- MCP server analysis complete: identified authorization issues with mcp-business user
- Found that mcp-business lacks proper entity permissions (e.g., mantle.shipment.ShipmentParty)
- Need to implement role-based access control for proper MCP business functionality
- Foundation is solid - 1,200+ services and screens exposed, but authorization layer needed

@@ -982,48 +982,6 @@ try {
 
 
 
-    <service verb="list" noun="Products" authenticate="true" allow-remote="true" transaction-timeout="30">
-        <description>List products with basic information for MCP business toolkit</description>
-        <in-parameters>
-            <parameter name="productCategoryId" required="false"/>
-            <parameter name="ownerPartyId" required="false"/>
-            <parameter name="pageSize" type="Integer" default="20"/>
-            <parameter name="pageIndex" type="Integer" default="0"/>
-        </in-parameters>
-        <out-parameters>
-            <parameter name="products" type="List"/>
-            <parameter name="totalCount" type="Integer"/>
-        </out-parameters>
-        <actions>
-            <script><![CDATA[
-                import org.moqui.context.ExecutionContext
-                import org.moqui.impl.context.UserFacadeImpl.UserInfo
-                
-                ExecutionContext ec = context.ec
-                
-                def entityFind = ec.entity.find("mantle.product.Product")
-                
-                // Apply filters if provided
-                if (productCategoryId) {
-                    entityFind.condition("productCategoryId", productCategoryId)
-                }
-                if (ownerPartyId) {
-                    entityFind.condition("ownerPartyId", ownerPartyId)
-                }
-                
-                // Get total count
-                totalCount = entityFind.count()
-                
-                // Apply pagination
-                entityFind.orderBy("productName").limit(pageSize).offset(pageIndex * pageSize)
-                
-                // Get product list with basic fields
-                products = entityFind.selectFields(["productId", "productName", "description", "productTypeId", 
-                                                   "productCategoryId", "ownerPartyId", "internalName"]).list()
-                
-            ]]></script>
-        </actions>
-    </service>
 
     <!-- Screen-based MCP Services -->