refactor: consolidate MCP integration to unified gateway

**Changes**:
- Remove individual MCP server docs (superclaude/mcp/*.md)
- Remove MCP server configs (superclaude/mcp/configs/*.json)
- Delete MCP docs component (setup/components/mcp_docs.py)
- Simplify installer (setup/core/installer.py)
- Update components for unified gateway approach

**Rationale**:
- Unified gateway (airis-mcp-gateway) provides all MCP servers
- Individual docs/configs no longer needed (managed centrally)
- Reduces maintenance burden and file count
- Simplifies installation process

**Files Removed**: 17 MCP files (docs + configs)
**Installer Changes**: Removed legacy MCP installation logic

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

setup/components/__init__.py

@@ -5,7 +5,6 @@ from .commands import CommandsComponent
 from .mcp import MCPComponent
 from .agents import AgentsComponent
 from .modes import ModesComponent
-from .mcp_docs import MCPDocsComponent
 
 __all__ = [
     "FrameworkDocsComponent",
@@ -13,5 +12,4 @@ __all__ = [
     "MCPComponent",
     "AgentsComponent",
     "ModesComponent",
-    "MCPDocsComponent",
 ]