feat: 语音确认、联调与运维增强

- 语音：序数解析（第一个/第二个等）、解析失败计数与 API detail.retry_remaining；
  百度 ASR 固定 dev_pid 为普通话；SurgeryPipelineError 支持 extra 并入 HTTP detail。
- Demo：demo 路由与假 RTSP、客户端 index 与 README；BackendResolver 与配置调整。
- 可观测：消耗 TSV 日志、语音文件日志、终端 Markdown 辅助；相关测试与依赖更新。
- 注意：.env 仍被 gitignore，本地密钥不会进入本提交。

Made-with: Cursor

tests/test_voice_confirm.py

@@ -13,6 +13,21 @@ def test_parse_voice_choice_numeric() -> None:
     assert parse_voice_choice("第2个", ["纱布", "缝线", "钳子"]) == "缝线"
 
 
+def test_parse_voice_choice_ordinal_chinese() -> None:
+    opts = ["纱布", "缝线", "钳子"]
+    assert parse_voice_choice("第一个", opts) == "纱布"
+    assert parse_voice_choice("第一个。", opts) == "纱布"
+    assert parse_voice_choice("第2个", opts) == "缝线"
+    assert parse_voice_choice("第二", opts) == "缝线"
+    assert parse_voice_choice("选3", opts) == "钳子"
+    assert parse_voice_choice("选项2", ["纱布", "缝线"]) == "缝线"
+
+
+def test_parse_voice_choice_single_chinese_digit_with_few_options() -> None:
+    assert parse_voice_choice("一", ["纱布", "缝线"]) == "纱布"
+    assert parse_voice_choice("两", ["纱布", "缝线"]) == "缝线"
+
+
 def test_parse_voice_choice_negative() -> None:
     assert parse_voice_choice("不是", ["纱布", "缝线"]) is None