feat(agent): add document entry in sidebar footer and toolbar

- AgentSidebar: add '文档' link in footer-links (desktop + mobile)
- AgentToolbar: add file-text icon button linking to /agent-documents
- Users can now access documents directly from the chat interface

Co-authored-by: CodeFree <codefree@chinatelcom.cn>

app/components/agent/AgentSidebar.vue

@@ -53,6 +53,10 @@ const isAdmin = computed(() => props.user?.role === "admin");
 
     <div class="sidebar-footer">
       <div v-if="loggedIn" class="footer-links">
+        <NuxtLink to="/agent-documents" class="footer-link">
+          <Icon name="lucide:file-text" />
+          <span>文档</span>
+        </NuxtLink>
         <NuxtLink to="/settings" class="footer-link">
           <Icon name="lucide:settings" />
           <span>设置</span>
@@ -121,6 +125,10 @@ const isAdmin = computed(() => props.user?.role === "admin");
 
           <div class="sidebar-footer">
             <div v-if="loggedIn" class="footer-links">
+              <NuxtLink to="/agent-documents" class="footer-link">
+                <Icon name="lucide:file-text" />
+                <span>文档</span>
+              </NuxtLink>
               <NuxtLink to="/settings" class="footer-link">
                 <Icon name="lucide:settings" />
                 <span>设置</span>

app/components/agent/AgentToolbar.vue

@@ -53,6 +53,11 @@ const emit = defineEmits<{
       <button class="icon-btn" title="系统提示词设置" @click="emit('showPrompt')">
         <Icon name="lucide:settings-2" />
       </button>
+
+      <!-- Documents link -->
+      <NuxtLink to="/agent-documents" class="icon-btn" title="文档">
+        <Icon name="lucide:file-text" />
+      </NuxtLink>
     </div>
   </div>
 </template>