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

artemis/config/agent.py

@@ -18,7 +18,7 @@ import os
 from pathlib import Path
 from typing import Any
 
-from pydantic import AliasChoices, BaseModel, Field, model_validator
+from pydantic import BaseModel, Field, model_validator
 
 from artemis.config.constants import (
     AGENT_CONFIG_FILENAME,
@@ -289,7 +289,6 @@ class AgentGlobalConfig(BaseModel):
     denylisted_tools: dict[str, list[str]] = Field(
         default_factory=dict,
         description="List of denylisted tools per agent.",
-        validation_alias=AliasChoices("denylisted_tools", "blocklisted_tools"),
     )
     video_analyzer: VideoAnalyzerConfig = Field(
         default_factory=VideoAnalyzerConfig,