Azure APIM + MCP Server Demo

<!--
    Caching Policy for MCP Server
    
    This policy demonstrates APIM's caching capabilities:
    - Cache tool list responses
    - Cache product data responses
    - Vary cache by query parameters
-->
<policies>
    <inbound>
        <base />
        
        <!-- Cache lookup for GET requests -->
        <cache-lookup 
            vary-by-developer="false" 
            vary-by-developer-groups="false" 
            downstream-caching-type="none">
            <vary-by-query-parameter>category</vary-by-query-parameter>
            <vary-by-query-parameter>minPrice</vary-by-query-parameter>
            <vary-by-query-parameter>maxPrice</vary-by-query-parameter>
        </cache-lookup>
    </inbound>
    
    <backend>
        <base />
    </backend>
    
    <outbound>
        <base />
        
        <!-- Store successful responses in cache for 5 minutes -->
        <cache-store duration="300" />
        
        <!-- Add cache status header -->
        <set-header name="X-Cache-Status" exists-action="override">
            <value>@(context.Response.Headers.ContainsKey("X-Cache") ? "HIT" : "MISS")</value>
        </set-header>
    </outbound>
    
    <on-error>
        <base />
    </on-error>
</policies>