feat(station_broadcast): 新增远程音频流下载与mp3、ogg格式播放支持

新增downloadAudioBytes工具函数用于从远程URL下载音频数据并提取文件扩展名
重构stream格式音频的处理逻辑，先下载资源再根据扩展名适配播放格式
补充mp3和ogg格式的播放适配，覆盖主扬声器控制器与单个扬声器

station_broadcast.lua

@@ -671,6 +671,26 @@ local function areHqSpeakersBusy(speakers)
     return false
 end
 
+local function downloadAudioBytes(url)
+    if type(url) ~= "string" or url == "" then return nil, nil, "empty url" end
+    local ok, resp = pcall(function()
+        return http.get(url, nil, true)
+    end)
+    if not ok or not resp then
+        return nil, nil, "http.get failed"
+    end
+
+    local body = resp.readAll()
+    resp.close()
+    if type(body) ~= "string" or #body == 0 then
+        return nil, nil, "empty response body"
+    end
+
+    local lower = url:lower()
+    local ext = lower:match("%.([%a%d]+)$")
+    return body, ext or "file", nil
+end
+
 local function playHqAudioItem(item)
     if not Peripherals.speakers or #Peripherals.speakers == 0 then
         Utils.log("WARN", "No speakers found; cannot play audio")
@@ -682,15 +702,30 @@ local function playHqAudioItem(item)
     if type(payload) ~= "string" or #payload == 0 then return end
 
     local format = tostring(item.audioFormat or "file"):lower()
+    if format == "stream" then
+        local bytes, ext, err = downloadAudioBytes(payload)
+        if not bytes then
+            Utils.log("ERROR", "Failed to download stream audio: " .. tostring(err))
+            return
+        end
+        payload = bytes
+        if ext == "wav" then format = "wav"
+        elseif ext == "mp3" then format = "mp3"
+        elseif ext == "ogg" then format = "ogg"
+        else format = "file" end
+    end
+
     local controller = Peripherals.speakers[1]
     local called = false
 
     if controller then
         local ok, result = pcall(function()
-            if format == "stream" and type(controller.speakStreamAll) == "function" then
-                return controller.speakStreamAll(payload, CONFIG.AUDIO_VOLUME)
-            elseif format == "wav" and type(controller.speakWavAll) == "function" then
+            if format == "wav" and type(controller.speakWavAll) == "function" then
                 return controller.speakWavAll(payload, CONFIG.AUDIO_VOLUME)
+            elseif format == "mp3" and type(controller.speakMp3All) == "function" then
+                return controller.speakMp3All(payload, CONFIG.AUDIO_VOLUME)
+            elseif format == "ogg" and type(controller.speakOggAll) == "function" then
+                return controller.speakOggAll(payload, CONFIG.AUDIO_VOLUME)
             elseif type(controller.speakFileAll) == "function" then
                 return controller.speakFileAll(payload, CONFIG.AUDIO_VOLUME)
             end
@@ -703,10 +738,12 @@ local function playHqAudioItem(item)
     if not called then
         for _, sp in ipairs(Peripherals.speakers) do
             local ok, result = pcall(function()
-                if format == "stream" and type(sp.speakStream) == "function" then
-                    return sp.speakStream(payload, CONFIG.AUDIO_VOLUME)
-                elseif format == "wav" and type(sp.speakWav) == "function" then
+                if format == "wav" and type(sp.speakWav) == "function" then
                     return sp.speakWav(payload, CONFIG.AUDIO_VOLUME)
+                elseif format == "mp3" and type(sp.speakMp3) == "function" then
+                    return sp.speakMp3(payload, CONFIG.AUDIO_VOLUME)
+                elseif format == "ogg" and type(sp.speakOgg) == "function" then
+                    return sp.speakOgg(payload, CONFIG.AUDIO_VOLUME)
                 elseif type(sp.speakFile) == "function" then
                     return sp.speakFile(payload, CONFIG.AUDIO_VOLUME)
                 end