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

tests/unit/test_cli.py

@@ -27,7 +27,6 @@ def test_cli_help():
     assert "Artemis: Autonomous Multimodal Android Agent" in result.output
     assert "run" in result.output
     assert "batch" in result.output
-    assert "bench" in result.output
     assert "server" in result.output
     assert "trace" in result.output
     assert "mcp" in result.output
@@ -63,3 +62,19 @@ def test_cli_trace_help():
     assert result.exit_code == 0
     assert "list" in result.output
     assert "view" in result.output
+
+
+def test_cli_mcp_help():
+    """Verify 'artemis mcp --help' lists server options."""
+    result = runner.invoke(app, ["mcp", "--help"])
+    assert result.exit_code == 0
+    assert "--type" in result.output
+    assert "--generate-config" in result.output
+
+
+def test_cli_mcp_generate_config():
+    """Verify 'artemis mcp --generate-config cursor' produces valid configuration."""
+    result = runner.invoke(app, ["mcp", "--generate-config", "cursor"])
+    assert result.exit_code == 0
+    assert "mcpServers" in result.output
+    assert "mcp_server" in result.output