feat: 重构音频系统，移除外部依赖并新增WAV格式支持

- 移除install和update脚本中的aukit/austream下载配置与目标，不再部署辅助脚本
- 替换station_broadcast.lua的aukit库为CC内置dfpwm模块，重写音频播放逻辑
- 添加原生扬声器API支持，支持WAV格式音频播放
- 重写云端服务器音频处理逻辑，支持直接传输WAV文件无需预转换
- 新增WAV文件时长解析、音频序列合成等辅助功能

station_broadcast-warning.lua

@@ -10,6 +10,8 @@ local COLORS = {
     SUCCESS = colors.green
 }
 
+local dfpwm = require "cc.audio.dfpwm"
+
 -- Debug output function
 local function debugPrint(level, message)
     local timestamp = os.date("%H:%M:%S")
@@ -21,6 +23,52 @@ local function debugPrint(level, message)
     term.setTextColor(oldColor)
 end
 
+local function playDfpwmFile(path, volume)
+    local speakers = { peripheral.find("speaker") }
+    if #speakers == 0 then
+        debugPrint("ERROR", "No speakers found")
+        return false
+    end
+
+    local file = fs.open(path, "rb")
+    if not file then
+        debugPrint("ERROR", "Cannot open audio file: " .. path)
+        return false
+    end
+
+    local decoder = dfpwm.make_decoder()
+    local controller = speakers[1]
+    while true do
+        local chunk = file.read(16 * 1024)
+        if not chunk then break end
+        local samples = decoder(chunk)
+
+        if controller and type(controller.playAudioAll) == "function" then
+            while not controller.playAudioAll(samples, volume) do
+                os.pullEvent("speaker_audio_empty")
+            end
+        else
+            local pending = {}
+            for _, sp in ipairs(speakers) do
+                pending[peripheral.getName(sp)] = sp
+            end
+            while next(pending) do
+                for name, sp in pairs(pending) do
+                    if sp.playAudio(samples, volume) then
+                        pending[name] = nil
+                    end
+                end
+                if next(pending) then
+                    os.pullEvent("speaker_audio_empty")
+                end
+            end
+        end
+    end
+
+    file.close()
+    return true
+end
+
 -- Add random audio playback function
 local function playRandomAudio()
     local audioFiles = {"aqtx", "jzxy"}
@@ -29,7 +77,7 @@ local function playRandomAudio()
     
     if fs.exists(path) then
         debugPrint("INFO", "Attempting to play: "..path)
-        shell.run("austream "..path.." volume=3.0")
+        playDfpwmFile(path, 3.0)
         debugPrint("INFO", "Finished playing: "..randomFile)
     else
         debugPrint("ERROR", "Audio file not found: "..path)