feat(registry): add smithery.yaml, server.json, and MCP Registry verification tag

- smithery.yaml: Smithery.ai configuration for PyPI install via uvx
- server.json: Official MCP Registry manifest (io.github.airano-ir/mcphub)
- README.md: add <!-- mcp-name --> verification tag for MCP Registry publishing

Part of D.4 — MCP Registry submissions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -1,3 +1,5 @@
+<!-- mcp-name: io.github.airano-ir/mcphub -->
+
 # MCP Hub
 
 <div align="center">