feat: add proto codegen pipeline with buf and connect-es

- Add llm-multiverse repo as git submodule for proto files
- Configure buf with @bufbuild/protoc-gen-es for TypeScript codegen
- Generate typed Connect service stubs to src/lib/proto/
- Add `generate` npm script for proto regeneration
- Exclude generated proto files from ESLint

Closes #2

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

eslint.config.js

@@ -18,6 +18,6 @@ export default ts.config(
 		}
 	},
 	{
-		ignores: ['build/', '.svelte-kit/', 'dist/']
+		ignores: ['build/', '.svelte-kit/', 'dist/', 'src/lib/proto/']
 	}
 );