fix: resolve Claude Desktop stdio communication issues and update documentation

- Fixed console output interference with stdio JSON-RPC protocol:
  - Modified logger to suppress ALL output in stdio mode
  - Added DISABLE_CONSOLE_OUTPUT environment variable support
  - Updated error handlers to respect stdio mode

- Updated Claude Desktop configuration documentation:
  - Added required environment variables for clean stdio communication
  - Promoted local installation as recommended method
  - Fixed remote connection instructions (removed broken mcp-remote)
  - Added troubleshooting section for common issues
  - Updated both README.md and docs/README_CLAUDE_SETUP.md

- Environment variables now required for stdio mode:
  - MCP_MODE=stdio
  - LOG_LEVEL=error
  - DISABLE_CONSOLE_OUTPUT=true
  - NODE_ENV=production

This ensures clean JSON-RPC communication without console output corruption.

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

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

src/utils/logger.ts

@@ -54,6 +54,12 @@ export class Logger {
     if (level <= this.config.level) {
       const formattedMessage = this.formatMessage(levelName, message);
       
+      // In stdio mode, suppress ALL console output to avoid corrupting JSON-RPC
+      if (process.env.MCP_MODE === 'stdio' || process.env.DISABLE_CONSOLE_OUTPUT === 'true') {
+        // Silently drop all logs in stdio mode
+        return;
+      }
+      
       // In HTTP mode during request handling, suppress console output
       // The ConsoleManager will handle this, but we add a safety check
       if (process.env.MCP_MODE === 'http' && process.env.MCP_REQUEST_ACTIVE === 'true') {