What are the best practices for structuring a large-scale AngularJS application?

Instruction: Outline your approach to organizing code, files, and modules in a large AngularJS application.

Context: Candidates must demonstrate their ability to architect scalable and maintainable applications using AngularJS.

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For an existing AngularJS 1.x application, organize code around business features: for example, orders/ contains its module, components, templates, API service and tests. A small application module declares the feature dependencies. Put genuinely shared UI or infrastructure in clearly owned shared modules; avoid a single miscellaneous module that every feature modifies.

Keep controllers focused on view state and interaction. Put API access and reusable business operations in injected services, and keep DOM-specific behavior in components or directives...

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