Add barrelsby configuration and regenerate model barrel files using the tool to standardize exports and automate maintenance of index.ts files across model directories.
Add barrelsby as a dev dependency with a `generate-barrels` npm script and a `barrelesby.json` config targeting `./src`. This automates creation of barrel/index files to simplify imports across the project.
- Move app files into src/ directory following Next.js convention
- Add baseUrl: src/ to tsconfig.json for path resolution
- Add .vscode/launch.json with debug configs for dev/build/start/lint
- Add lint:fix npm script to package.json
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