refactor(engine): 修改虚拟环境设置，修改音频工具函数

- 更新虚拟环境目录名为 .venv
- 调整音频块采集速率默认值为 10
- 为 AudioStream 类添加重设音频块大小的方法
- 更新依赖文件 requirements.txt

src/main/utils/CaptionEngine.ts

@@ -37,7 +37,7 @@ export class CaptionEngine {
         if(process.platform === "win32") {
           this.appPath = path.join(
             app.getAppPath(), 'engine',
-            'subenv', 'Scripts', 'python.exe'
+            '.venv', 'Scripts', 'python.exe'
           )
           this.command.push(path.join(
             app.getAppPath(), 'engine', 'main.py'
@@ -47,7 +47,7 @@ export class CaptionEngine {
         else {
           this.appPath = path.join(
             app.getAppPath(), 'engine',
-            'subenv', 'bin', 'python3'
+            '.venv', 'bin', 'python3'
           )
           this.command.push(path.join(
             app.getAppPath(), 'engine', 'main.py'