Move JSON schema to docs/ with public URL

Move binding-schema.json to docs/ directory and add $id field
pointing to the GitHub Pages URL for public access.
This enables external tools and developers to reference the
Ray.Di BindingInfo schema standardization.

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

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

Author: koriym

binding-schema.json renamed to docs/binding-schema.json

@@ -1,5 +1,6 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
+  "$id": "http://ray-di.github.io/Ray.Di/binding-schema.json",
   "title": "Ray.Di BindingInfo Schema",
   "description": "Schema for Ray.Di BindingInfo Value Objects",
   "type": "array",