feat(chat): allow knowledge chat before upload

templates/chat/index.html

@@ -53,7 +53,7 @@
             <li class="detail-item">
               <strong><a href="{% url 'chat:detail' item.conversation_id %}">{{ item.title }}</a></strong>
               <div class="muted">产品：{{ item.product_name|default:"未识别" }}</div>
-              <div class="muted">批次：{{ item.batch_id }}</div>
+              <div class="muted">批次：{{ item.batch_id|default:"未绑定" }}</div>
               <div class="muted">风险：{{ item.risk_level }}</div>
               <div class="muted">最近更新：{{ item.updated_at|date:"Y-m-d H:i" }}</div>
               <div class="badge-row" style="margin-top: 8px;">
@@ -61,7 +61,10 @@
               </div>
             </li>
           {% empty %}
-            <li class="detail-item">暂无会话，请先从资料包页面导入资料。</li>
+            <li class="detail-item">
+              <strong>暂无历史会话</strong>
+              <div class="muted">可以直接在中间区域提问，Agent 会优先检索知识库。</div>
+            </li>
           {% endfor %}
         </ul>
       </article>
@@ -75,13 +78,14 @@
             <p class="section-copy">中间区域承接用户问题、Agent 回答和节点式结果摘要。</p>
           </div>
         </div>
-        {% if conversation %}
+        {% if node_results %}
           <div class="badge-row" style="margin-bottom: 14px;">
             {% for node in node_results %}
               <span class="pill {% if node.status == '已完成' %}pill-success{% else %}pill-signal{% endif %}">{{ node.label }} / {{ node.status }}</span>
             {% endfor %}
           </div>
-          <form method="post" class="stack">
+        {% endif %}
+          <form method="post" class="stack" action="{% if conversation %}{% url 'chat:detail' conversation.conversation_id %}{% else %}{% url 'chat:index' %}{% endif %}">
             {% csrf_token %}
             <div>
               {{ form.message.label_tag }}
@@ -99,12 +103,12 @@
                     <span>{{ checkbox.choice_label }}</span>
                   </label>
                 {% empty %}
-                  <div class="notice">当前资料包还没有可选文档。</div>
+                  <div class="notice">未选择文档时，Agent 会按问题检索当前知识库。</div>
                 {% endfor %}
               </div>
             </div>
             <div class="button-row">
-              <button type="submit">提交审核任务</button>
+              <button type="submit">发送问题</button>
             </div>
           </form>
           {% if result %}
@@ -112,10 +116,9 @@
               <strong>Agent 回答</strong>
               <div>{{ result.answer|linebreaksbr }}</div>
             </div>
+          {% elif not conversation %}
+            <div class="notice" style="margin-top: 16px;">可以先不上传资料，直接询问注册法规、资料清单、模板字段或历史知识库内容。</div>
           {% endif %}
-        {% else %}
-          <div class="notice">暂无会话，请先导入资料包。</div>
-        {% endif %}
       </article>
 
       <article class="panel">
@@ -423,7 +426,20 @@
             </div>
           </form>
         {% else %}
-          <div class="notice">暂无绑定资料包。</div>
+          <div class="notice">暂无绑定资料包，仍可先通过中间对话区查询知识库。</div>
+          <form method="post" action="{% url 'documents:upload' %}" enctype="multipart/form-data" class="stack" style="margin-top: 16px;">
+            {% csrf_token %}
+            <input type="hidden" name="scenario_id" value="document_review">
+            <div>
+              {{ upload_form.files.label_tag }}
+              {{ upload_form.files }}
+              <p class="help-text">支持 PDF、DOCX、MD、TXT、ZIP、7Z 与 RAR。上传后会自动形成资料包并绑定新的审核会话。</p>
+            </div>
+            <div class="button-row">
+              <button type="submit">导入资料包</button>
+              <a class="button" href="{% url 'documents:upload' %}">打开导入向导</a>
+            </div>
+          </form>
         {% endif %}
       </article>
 
@@ -456,7 +472,7 @@
               {% endif %}
             </div>
           </li>
-          <li class="detail-item">当前会话围绕 `conversation_id / batch_id / product_name` 串联。</li>
+          <li class="detail-item">当前会话围绕 conversation_id / batch_id / product_name 串联；未绑定资料包时以知识库问答方式执行。</li>
           {% if audit_log %}
             <li class="detail-item"><a href="{% url 'audit:detail' audit_log.id %}">查看本次处理历史</a></li>
           {% endif %}