将 Demo 录制收敛为三条独立链路，并重做联调台 UI。

移除 demo_orch 统一编排，改为 recording_demo 与 live/simulated 服务；客户端拆分为静态资源，以模式卡片与 chip 耗材覆盖三链路联调，并同步测试与文档。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/api.py

@@ -33,11 +33,9 @@ from app.schemas import (
     VoiceTerminalAssignmentResponse,
     build_consumption_summary,
 )
+from app.services.recording_live import accept_live_recording
 from app.services.surgery_pipeline import SurgeryPipeline
-from app.services.voice_terminal_hub import (
-    VoiceTerminalHub,
-    assign_voice_terminal_after_recording_started,
-)
+from app.services.voice_terminal_hub import VoiceTerminalHub
 from app.surgery_errors import SurgeryPipelineError
 
 router = APIRouter()
@@ -135,19 +133,21 @@ async def health() -> HealthResponse | JSONResponse:
 
 
 @router.get(
-    "/internal/demo/orchestrator-status",
+    "/internal/demo/recording-modes-status",
     tags=["demo"],
-    summary="一键联调接口是否可用",
-    description="供 demo 页探测：是否启用 orchestrator、RTSP 文件配置等；此路由始终存在，不依赖 DEMO_ORCHESTRATOR_ENABLED。",
+    summary="Demo 录制模式（链路 2/3）是否可用",
+    description="供 demo 页探测；始终注册，不依赖 DEMO_ORCHESTRATOR_ENABLED。",
 )
-async def demo_orchestrator_status() -> dict:
+async def recording_modes_status() -> dict:
     f = (settings.or_site_config_json_file or "").strip()
+    enabled = bool(settings.demo_orchestrator_enabled)
     return {
-        "orchestrator_enabled": bool(settings.demo_orchestrator_enabled),
-        "orchestrate_method": "POST",
-        "orchestrate_path": "/internal/demo/orchestrate-and-start",
-        "video_batch_method": "POST",
-        "video_batch_path": "/internal/demo/video-batch-surgery",
+        "demo_recording_modes_enabled": enabled,
+        "orchestrator_enabled": enabled,
+        "simulated_start_method": "POST",
+        "simulated_start_path": "/internal/demo/simulated-start",
+        "offline_batch_method": "POST",
+        "offline_batch_path": "/internal/demo/offline-batch",
         "or_site_config_json_file_set": bool(f),
         "or_site_config_json_file": f or None,
         "orchestrator_rtsp_port": settings.demo_orchestrator_rtsp_port,
@@ -181,15 +181,20 @@ async def start_surgery(
         payload.camera_ids,
         payload.candidate_consumables,
     )
+    accepted: SurgeryApiResponse | None = None
+
+    async def _start() -> None:
+        nonlocal accepted
+        accepted = await accept_live_recording(
+            pipeline,
+            voice_hub,
+            surgery_id=payload.surgery_id,
+            camera_ids=list(payload.camera_ids),
+            candidate_consumables=list(payload.candidate_consumables),
+            message="摄像头录制已开始，手术已启动。",
+        )
+
     try:
-
-        async def _start() -> None:
-            await pipeline.start_recording(
-                payload.surgery_id,
-                payload.camera_ids,
-                payload.candidate_consumables,
-            )
-
         await _call_recording_with_retries(
             _start,
             max_attempts=bp.SURGERY_RECORDING_MAX_ATTEMPTS,
@@ -199,18 +204,8 @@ async def start_surgery(
     except SurgeryPipelineError as exc:
         _raise_surgery_pipeline_http(exc, payload.surgery_id)
 
-    await assign_voice_terminal_after_recording_started(
-        voice_hub,
-        surgery_id=payload.surgery_id,
-        camera_ids=list(payload.camera_ids),
-        set_voice_terminal_id=pipeline.set_voice_terminal_id,
-    )
-
-    return SurgeryApiResponse(
-        surgery_id=payload.surgery_id,
-        status="accepted",
-        message="摄像头录制已开始，手术已启动。",
-    )
+    assert accepted is not None
+    return accepted
 
 
 @router.post(