feat: surgery pipeline API, video inference, voice confirm, and tests

- Add FastAPI routes for surgery start/end, results, pending confirmation (WAV upload), and health checks.
- Implement RTSP/Hikvision capture, consumable classification, session manager, MinIO/Baidu voice resolution, and DB persistence.
- Add documentation (client API, video backends, staging checklist) and sample camera/RTSP config.
- Add pytest suite (API contract, session manager, voice, repositories, pipeline persistence) and httpx dev dependency.
- Replace deprecated HTTP_422_UNPROCESSABLE_ENTITY with HTTP_422_UNPROCESSABLE_CONTENT.
- Fix SurgeryPipeline DB reads to use an explicit transaction with autobegin disabled.

Made-with: Cursor

app/repositories/voice_audits.py

@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+from datetime import datetime, timezone
+
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.db.models import VoiceConfirmationAudit
+
+
+class VoiceAuditRepository:
+    """Persist voice confirmation audit rows."""
+
+    async def save_audit(
+        self,
+        session: AsyncSession,
+        *,
+        surgery_id: str,
+        confirmation_id: str,
+        status: str,
+        audio_object_key: str | None,
+        audio_content_type: str | None,
+        audio_size_bytes: int | None,
+        audio_sha256: str | None,
+        asr_text: str | None,
+        resolved_label: str | None,
+        options_snapshot_json: str | None,
+        error_message: str | None,
+        created_at: datetime | None = None,
+    ) -> None:
+        when = created_at or datetime.now(timezone.utc)
+        row = VoiceConfirmationAudit(
+            surgery_id=surgery_id,
+            confirmation_id=confirmation_id,
+            status=status,
+            audio_object_key=audio_object_key,
+            audio_content_type=audio_content_type,
+            audio_size_bytes=audio_size_bytes,
+            audio_sha256=audio_sha256,
+            asr_text=asr_text,
+            resolved_label=resolved_label,
+            options_snapshot_json=options_snapshot_json,
+            error_message=error_message,
+            created_at=when,
+        )
+        session.add(row)
+        await session.flush()