添加配置管理功能，包括获取和设置配置值的接口及实现

Web/src/views/BillAnalysisView.vue

@@ -6,7 +6,16 @@
       left-arrow 
       placeholder 
       @click-left="onClickLeft"
-    />
+    >
+      <template #right>
+        <van-icon 
+          name="question-o" 
+          size="20" 
+          @click="onClickPrompt"
+          style="cursor: pointer; padding-right: 12px;"
+        />
+      </template>
+    </van-nav-bar>
 
     <div class="scroll-content analysis-content">
       <!-- 输入区域 -->
@@ -71,13 +80,32 @@
         </div>
       </div>
     </div>
+
+    <!-- 提示词设置弹窗 -->
+    <van-dialog
+      v-model:show="showPromptDialog"
+      title="编辑分析提示词"
+      :show-cancel-button="true"
+      @confirm="confirmPrompt"
+    >
+      <van-field
+        v-model="promptValue"
+        rows="4"
+        autosize
+        type="textarea"
+        maxlength="2000"
+        placeholder="输入自定义的分析提示词..."
+        show-word-limit
+      />
+    </van-dialog>
   </div>
 </template>
 
 <script setup>
 import { ref, nextTick } from 'vue'
 import { useRouter } from 'vue-router'
-import { showToast } from 'vant'
+import { showToast, showLoadingToast, closeToast } from 'vant'
+import { getConfig, setConfig } from '@/api/config'
 
 const router = useRouter()
 const userInput = ref('')
@@ -87,6 +115,10 @@ const resultHtml = ref('')
 const resultContainer = ref(null)
 const scrollAnchor = ref(null)
 
+// 提示词弹窗相关
+const showPromptDialog = ref(false)
+const promptValue = ref('')
+
 // 快捷问题
 const quickQuestions = [
   '最近三个月交通费用多少？',
@@ -100,6 +132,45 @@ const onClickLeft = () => {
   router.back()
 }
 
+// 点击提示词按钮
+const onClickPrompt = async () => {
+  try {
+    const response = await getConfig('BillAnalysisPrompt')
+    if (response.success) {
+      promptValue.value = response.data || ''
+    }
+  } catch (error) {
+    console.error('获取提示词失败:', error)
+  }
+  showPromptDialog.value = true
+}
+
+// 确认提示词
+const confirmPrompt = async () => {
+  if (!promptValue.value.trim()) {
+    showToast('请输入提示词')
+    return
+  }
+
+  showLoadingToast({
+    message: '保存中...',
+    forbidClick: true
+  })
+
+  try {
+    const response = await setConfig('BillAnalysisPrompt', promptValue.value)
+    if (response.success) {
+      showToast('提示词已保存')
+      showPromptDialog.value = false
+    }
+  } catch (error) {
+    console.error('保存提示词失败:', error)
+    showToast('保存失败，请重试')
+  } finally {
+    closeToast()
+  }
+}
+
 // 选择快捷问题
 const selectQuestion = (question) => {
   userInput.value = question