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>

superclaude/cli/commands/doctor.py

@@ -90,7 +90,6 @@ def run_diagnostics() -> dict:
     if install_dir.exists():
         components = {
             "CLAUDE.md": "Core framework entry point",
-            "MCP_*.md": "MCP documentation files",
             "MODE_*.md": "Behavioral mode files",
         }
 
@@ -100,13 +99,6 @@ def run_diagnostics() -> dict:
             "message": "Installed" if claude_md.exists() else "Not installed",
         }
 
-        # Count MCP docs
-        mcp_docs = list(install_dir.glob("MCP_*.md"))
-        results["MCP Documentation"] = {
-            "status": len(mcp_docs) > 0,
-            "message": f"{len(mcp_docs)} servers documented" if mcp_docs else "None installed",
-        }
-
         # Count modes
         mode_files = list(install_dir.glob("MODE_*.md"))
         results["Behavioral Modes"] = {