fix(ena-planner): align channel options and model-fetch behavior with story-summary

modules/ena-planner/ena-planner.html

@@ -103,9 +103,6 @@
                 <option value="openai">OpenAI compatible</option>
                 <option value="gemini">Gemini compatible</option>
                 <option value="claude">Claude compatible</option>
-                <option value="deepseek">DeepSeek compatible</option>
-                <option value="cohere">Cohere compatible</option>
-                <option value="custom">Custom compatible</option>
               </select>
             </div>
             <div class="form-group hidden" id="ep_model_row">
@@ -123,7 +120,6 @@
               <input id="ep_api_key" type="password" class="input" placeholder="仅本地保存，不上传">
             </div>
           </div>
-          <div class="form-hint">不需要填写 /v1 前缀，后端会按渠道自动处理。</div>
           <div id="ep_model_selector" class="hidden" style="margin-top:12px;">
             <label class="form-label">选择模型</label>
             <select id="ep_model_select" class="input">