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
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