feat: add multi-device concurrency, server lifecycle CLI, and unified execution stream

- Implement DevicePool and DeviceExecutionLock concurrency modes (per-device FIFO vs global serialization)
- Extend ArtemisClient SDK and CLI with explicit device targeting and concurrency strategy configuration
- Add server lifecycle management (artemis restart, stop, status) with cross-platform PID discovery
- Update MCP server tools to support multi-device dispatch, trace tagging, and per-device execution
- Enhance Showcase UI with step-by-step visual replay, playback speed controls, and device serial badges
- Add comprehensive unit test coverage and edge-case verification scripts

apps/admin_console/schemas/task_schema.py

@@ -23,6 +23,8 @@ class RunRequest(BaseModel):
     enable_outputter: bool | None = None
     locked_app_package: str | None = None
     app_path: str | None = None
+    device_serial: str | None = None
+
 
 
 class ReplayRequest(BaseModel):