Fix tools visibility - revert to v0.1.6 authentication approach

- Disable issuer validation in BearerAuthProvider (issuer=None)
- Simplify authentication condition (remove auth_enabled check)
- Revert CORS middleware to simple configuration
- Fix OAuth metadata endpoint to match v0.1.6
- Apply conditional auth only to MCP server creation

Critical fixes for Claude AI tools discovery

saidsurucu-yargi-mcp-f5fa007/__main__.py

@@ -0,0 +1,7 @@
+#!/usr/bin/env python3
+"""Entry point for yargi-mcp package."""
+
+from mcp_server_main import main
+
+if __name__ == "__main__":
+    main()