fix: Fix eslint errors in types package

- Replace Function type with proper function signature in api.ts
- Remove generated .d.ts and .js files from src directory
- Update .gitignore to prevent generated files in src
- All packages now pass lint with 0 errors (only warnings remain)
- Fixes: utils?: Record<string, Function> -> utils?: Record<string, (...args: any[]) => any>

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

packages/types/.gitignore

@@ -1,2 +1,7 @@
 dist/
 node_modules/
+# Ignore generated files in src (should only be in dist)
+src/**/*.d.ts
+src/**/*.js
+!src/**/*.test.ts
+!src/**/*.test.js