llama model cache, a few bugfixes

frontend/src/views/Agent.vue

@@ -344,7 +344,7 @@
         <span class="label">{{ configField.name }}</span>
         <input type="checkbox" v-model="configField.enabled" />
         <br>
-        <select v-if="configField.kind == 'model_id'" v-model="configField.value">
+        <select v-if="configField.kind == 'model_id'" v-model="configField.value" :disabled="!configField.enabled">
           <option v-if="!modelList.length" disabled>empty</option>
           <option :value="model.id" v-for="model in modelList">{{ model.name }}</option>
         </select>