Remove embedded OAuth implementation and flatten directory structure

Simplified the repository to have a single OAuth pattern with separate auth and MCP servers at the top level. Preserved embedded OAuth documentation as an alternative pattern.

embedded-oauth/eslint.config.mjs

@@ -1,19 +0,0 @@
-// @ts-check
-
-import eslint from '@eslint/js';
-import tseslint from 'typescript-eslint';
-
-export default tseslint.config(
-    eslint.configs.recommended,
-    ...tseslint.configs.recommended,
-    {
-        linterOptions: {
-            reportUnusedDisableDirectives: false,
-        },
-        rules: {
-            "@typescript-eslint/no-unused-vars": ["error",
-                { "argsIgnorePattern": "^_" }
-            ]
-        }
-    }
-);