feat: introduce MCP server, cross-platform runtime, and Showcase UI reorganization

- Showcase UI Reorganization:
  * Move web UI dashboard from root directory into apps/showcase_ui/ for cleaner project structure
  * Add 'artemis ui' CLI command (artemis/interfaces/cli/commands/ui.py) and launcher scripts for the interactive showcase console
- Standalone MCP Server & Notifiers (mcp_server/):
  * Implement dedicated MCP server package with mobile automation tools (device_state, inspect_trace, task_manager, task_runner)
  * Add multi-channel notifiers (AgentAPI, Desktop notifications, Webhooks, File output, and Composite routing)
  * Introduce background task runner and trace store for autonomous mobile execution monitoring
- Cross-Platform Runtime & Toolchain Support:
  * Add artemis/platform/ with OS-specific implementations for Linux, macOS (Darwin), and Windows
  * Add artemis/runtime/supervisor.py for resilient process and agent runtime supervision
  * Add artemis/toolchain/ with dependency resolution and SDK descriptors
  * Add cross-platform launcher scripts (start.sh, start.bat) and installer scripts (scripts/install_deps.*)
- Core Enhancements & Diagnostics:
  * Enhance coordinate normalization, OCR API fallback, and perception pipeline
  * Add credential validation (credentials_validator.py) and system diagnostics
  * Update bilingual documentation (README.md, README_CN.md) and architecture diagrams
- Test Suite Expansion:
  * Add integration tests for cloud gateway, remote ADB, and Artemis login
  * Add unit tests covering core diagnostics, platform detection, toolchain, credentials validator, optional OCR, and MCP tools

apps/admin_console/services/ipc_service.py

@@ -78,7 +78,7 @@ class IPCService:
                 except Exception:
                     pass
 
-            if tr_type == "tool" and isinstance(payload, dict):
+            if tr_type in ("tool", "action") and isinstance(payload, dict):
                 args = payload.get("args", payload)
                 data["payload"] = {"args": cls._clean_value(args)}
             elif tr_type == "llm_call" and isinstance(payload, dict):
@@ -144,8 +144,17 @@ class IPCService:
                     data = payload.get("data")
 
                     if event_type == "session_started" and data:
-                        state.active_session_id = data.get("session_id")
-                        current_session_id = data.get("session_id")
+                        incoming_sid = data.get("session_id")
+                        if incoming_sid and str(incoming_sid) in getattr(
+                            state, "cancelled_session_ids", set()
+                        ):
+                            print(
+                                f"[IPC] Ignoring session_started for cancelled session: {incoming_sid}"
+                            )
+                            continue
+
+                        state.active_session_id = incoming_sid
+                        current_session_id = incoming_sid
                         pid = data.get("pid")
                         goal = data.get("initial_goal")
                         device_info = data.get("device_info")