修改范围覆盖mobile/api目录下所有API文件(共9个，包括auth.ts)

统一使用index.ts中的全局axios配置
移除了所有重复的API_BASE_URL定义
简化了所有API调用路径格式
提高了代码一致性和可维护性
确保所有API功能保持正常

client/mobile/api/theme.ts

@@ -1,16 +1,14 @@
 import axios from 'axios';
-import type { 
+import type {
   ThemeSettings
 } from '../../share/types.ts';
 
-const API_BASE_URL = '/api';
-
 // Theme API 定义
 export const ThemeAPI = {
   // 获取主题设置
   getThemeSettings: async (): Promise<ThemeSettings> => {
     try {
-      const response = await axios.get(`${API_BASE_URL}/theme`);
+      const response = await axios.get('/theme');
       return response.data.data;
     } catch (error) {
       throw error;
@@ -20,7 +18,7 @@ export const ThemeAPI = {
   // 更新主题设置
   updateThemeSettings: async (themeData: Partial<ThemeSettings>): Promise<ThemeSettings> => {
     try {
-      const response = await axios.put(`${API_BASE_URL}/theme`, themeData);
+      const response = await axios.put('/theme', themeData);
       return response.data.data;
     } catch (error) {
       throw error;
@@ -30,7 +28,7 @@ export const ThemeAPI = {
   // 重置主题设置
   resetThemeSettings: async (): Promise<ThemeSettings> => {
     try {
-      const response = await axios.post(`${API_BASE_URL}/theme/reset`);
+      const response = await axios.post('/theme/reset');
       return response.data.data;
     } catch (error) {
       throw error;