feat(voice-client): PySide6 desktop client and Windows build scripts

Add voice_confirmation_client (poll, TTS MP3 playback, mic WAV resolve),
PyInstaller spec, start/build helpers, and API unit tests.

Pending manual testing: end-to-end on OR workstations and packaged exe.

Made-with: Cursor

tests/test_voice_confirmation_client_api.py

@@ -0,0 +1,48 @@
+"""Core HTTP client tests (no PySide6)."""
+
+from __future__ import annotations
+
+import httpx
+import pytest
+
+from voice_confirmation_client.core.api import ConfirmationApiClient
+
+
+def test_post_resolve_url_encoding(monkeypatch: pytest.MonkeyPatch) -> None:
+    captured: dict = {}
+
+    def handler(request: httpx.Request) -> httpx.Response:
+        captured["url"] = str(request.url)
+        return httpx.Response(200, json={"status": "accepted"})
+
+    transport = httpx.MockTransport(handler)
+    client = ConfirmationApiClient("http://example.test:8080")
+    client._client = httpx.Client(transport=transport)  # noqa: SLF001
+
+    st, body = client.post_resolve("123456", "c/id+here", b"RIFF....", "voice.wav")
+    assert st == 200
+    assert isinstance(body, dict)
+    assert body.get("status") == "accepted"
+    assert captured["url"].endswith(
+        "/client/surgeries/123456/pending-confirmation/c%2Fid%2Bhere/resolve"
+    )
+
+    client.close()
+
+
+def test_parse_pending() -> None:
+    client = ConfirmationApiClient("http://localhost")
+    raw = {
+        "surgery_id": "123456",
+        "confirmation_id": "abc",
+        "prompt_text": "请确认",
+        "prompt_audio_mp3_base64": "AA",
+        "options": [{"label": "纱布", "confidence": 0.4}],
+        "model_top1_label": "x",
+        "model_top1_confidence": 0.41,
+        "created_at": "2026-01-01T00:00:00+00:00",
+    }
+    p = client.parse_pending(raw)
+    assert p.confirmation_id == "abc"
+    assert p.prompt_text == "请确认"
+    client.close()