Fork @sinclair/typemap to @alkdev/typemap with @alkdev/typebox backend

- Rename package to @alkdev/typemap, update peerDeps to @alkdev/typebox
- Replace all @sinclair/typebox imports with @alkdev/typebox
- Replace @sinclair/hammer build system with standalone build.mjs
- Remove upstream-only files (.github, .vscode, design/, typemap.png)
- Update readme with fork notice and new package names
- Add fork copyright to license

tsconfig.json

@@ -5,7 +5,7 @@
     "moduleResolution": "Node",
     "baseUrl": ".",
     "paths": {
-      "@sinclair/typemap": ["src/index.ts"]
+      "@alkdev/typemap": ["src/index.ts"]
     }
   }
-}
+}