Ability to inherit auth credentials

[orbaps]

🚀 Pull Request: Auth Inheritance Feature

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🧩 PR Description

This PR implements the Auth Inheritance Feature for the APIDash project — enabling requests to inherit authentication credentials from their active environment.

🌍 Overview

This brings Postman/Insomnia-like behavior, where users can define authentication at the environment level and reuse it across multiple requests automatically.

🔧 Problem

Previously, APIDash only supported per-request authentication, forcing users to manually configure identical credentials for multiple requests — causing:

• Repetitive setup
• Difficult credential management
• Lack of centralized control

💡 Solution

Auth inheritance adds the ability for requests to use the environment’s default authentication when selected.
Implemented by:

1. Extending EnvironmentModel to include default authentication
2. Adding authInheritanceType in HttpRequestModel (Enum: none, environment)
3. Modifying CollectionStateNotifier to apply inherited auth dynamically
4. Enhancing the UI to manage and visualize inheritance states

⚙️ Key Technical Changes

• Added defaultAuthModel field in EnvironmentModel
• Added authInheritanceType field (AuthInheritanceType enum) in HttpRequestModel
• Created AuthInheritanceType enum with values:
  • none → Use request-specific auth
  • environment → Inherit from environment
• Updated request processing logic in CollectionStateNotifier
• Added UI components:
  • Dropdown for inheritance type selection
  • Environment Auth tab for environment-level credentials
• Added comprehensive test coverage for all new models, logic, and UI elements

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🧠 Benefits

✅ Reduced Duplication: Single configuration for multiple requests
✅ Centralized Management: Modify environment-level auth once, apply everywhere
✅ Familiar Workflow: Mirrors Postman/Insomnia UX
✅ Backward Compatible: Default behavior unchanged (none)
✅ Environment Variable Support: Works with inherited credentials

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🔗 Related Issues

Ability to inherit auth credentials #881

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✅ Checklist

• I have gone through the contributing guide
• I have updated my branch and synced it with project main before making this PR
• I am using the latest Flutter stable branch (flutter upgrade)
• I have run all tests (flutter test) and verified they pass

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🧪 Added / Updated Tests

We encourage you to add relevant test cases.

• Yes
• No, and this is why: please explain

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💻 OS Used for Development and Testing

• Windows
• macOS
• Linux

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🧩 References

• Auth Inheritance Implementation
• AuthInheritanceType Enum
• Auth Inheritance Implementation (UI)

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🧑‍💻 Author: @orbaps
📅 Date: 1st November