Add a C++/Qt6/CMake CLI prototype that captures the default sink monitor through libpulse and transcribes it in-process with Qwen3-ASR via libllama/libmtmd. Add phase 0/1 verification docs. 新增实时字幕命令行原型:libpulse 采集默认输出 monitor,进程内用 libllama/libmtmd 跑 Qwen3-ASR 推理。附阶段 0/1 验证文档。