refactor(frontend): improve API and component handling

优化文件内容组件和API工具函数，改进错误处理和配置管理。

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/utils/api.js

@@ -1,4 +1,4 @@
-import { API_URL, API_KEY, TTS_URL, TTS_STATUS_URL } from './config.js'
+import { API_URL, API_KEY, TTS_URL, TTS_STATUS_URL, TTS_CONFIG_URL } from './config.js'
 import { useSettingsStore } from '../stores/settings'
 
 function generateRequestId() {
@@ -146,3 +146,15 @@ export async function fetchTTSStatus(apiUrl = TTS_STATUS_URL) {
 
     return res.json()
 }
+
+export async function fetchTTSConfig(apiUrl = TTS_CONFIG_URL) {
+    const res = await fetch(apiUrl, {
+        headers: { 'X-API-Key': API_KEY },
+    })
+
+    if (!res.ok) {
+        throw new Error(`TTS Config HTTP ${res.status}`)
+    }
+
+    return res.json()
+}