feat: migrate TTS generation to frontend to utilize local browser proxy

CloudServer/public/tempbroadcast.html

@@ -322,6 +322,51 @@
                 .replaceAll("'", "'");
         }
 
+        async function _generateTTSLocal(text, reference_id) {
+            try {
+                // Client-side fetch to use local browser's proxy
+                const fishRes = await fetch('https://api.fish.audio/v1/tts', {
+                    method: 'POST',
+                    headers: {
+                        'Authorization': 'Bearer 233f3a9bcc204b20a1979d59d33cc649',
+                        'Content-Type': 'application/json'
+                    },
+                    body: JSON.stringify({
+                        text: text,
+                        reference_id: reference_id,
+                        model: TTS_MODEL,
+                        format: "wav"
+                    })
+                });
+
+                if (!fishRes.ok) {
+                    let msg = 'Fish Audio API Error';
+                    try { msg = await fishRes.text(); } catch(e){}
+                    throw new Error(`[${fishRes.status}] ${msg}`);
+                }
+
+                const audioBlob = await fishRes.blob();
+
+                // Upload the blob to the server as a temporary file
+                const formData = new FormData();
+                formData.append('audio', audioBlob, 'temp.wav');
+
+                const uploadRes = await fetch('/api/tts/upload_temp', {
+                    method: 'POST',
+                    body: formData
+                });
+
+                const data = await uploadRes.json();
+                if (!data.success) throw new Error(data.message);
+                return data;
+            } catch (err) {
+                if (err.name === 'TypeError' && err.message === 'Failed to fetch') {
+                    throw new Error('网络请求失败或跨域被拦截。如果启用了本地代理，请确保浏览器能访问外网接口。');
+                }
+                throw err;
+            }
+        }
+
         async function composeTempBroadcast() {
             const text = document.getElementById("tb_text").value.trim();
             if (!text) {
@@ -331,20 +376,24 @@
             document.getElementById("btn_publish").disabled = true;
             document.getElementById("btn_compose").disabled = true;
             document.getElementById("build_badge").textContent = "合成中…";
-            setStatus("合成临时广播中…");
+            setStatus("合成临时广播中(1/2: 生成语音)…");
             try {
-                const resp = await fetch("/api/temp-broadcast/compose", {
+                // 1. 本地生成 TTS 并上传获得临时文件名
+                const ttsData = await _generateTTSLocal(text, ZH_REFERENCE_ID);
+                
+                setStatus("合成临时广播中(2/2: 服务端混音)…");
+                // 2. 告诉服务端进行混音合并
+                const resp = await fetch("/api/temp-broadcast/build", {
                     method: "POST",
                     headers: { "Content-Type": "application/json" },
                     body: JSON.stringify({
-                        text,
-                        reference_id: ZH_REFERENCE_ID,
-                        model: TTS_MODEL,
+                        contentTempName: ttsData.tempName,
                         prefixName: "lsts"
                     })
                 });
                 const data = await resp.json();
                 if (!data || !data.success) throw new Error(data?.message || "合成失败");
+                
                 const preview = document.getElementById("preview_area");
                 preview.style.display = "block";
                 state.broadcastId = data.broadcastId;