Prepare dart-casbin for 1.0.0 semantic release

[Copilot]

Upgrades the package to production-ready 1.0.0 with modernized dependencies and improved documentation.

Code Quality

• Fixed unnecessary set literal warnings in file_adapter.dart
• Removed redundant imports across test files
• Corrected import ordering per lint rules

Dependencies

• Replaced deprecated pedantic with lints (^5.0.0)
• Extended SDK constraint to <4.0.0 for Dart 3.x compatibility
• Updated collection, expressions, quiver, and test to latest stable versions

Documentation

• Added installation instructions for both Dart and Flutter
• Added quick start example demonstrating enforcer usage
• Added pub.dev and CI status badges

// Now with clearer examples
import 'package:casbin/casbin.dart';

var enforcer = Enforcer('model.conf', 'policy.csv');
if (enforcer.enforce(['alice', 'data1', 'read'])) {
  // Permission granted
}

Version

• Bumped to 1.0.0 in pubspec.yaml
• Added comprehensive CHANGELOG entry documenting breaking changes (SDK version requirement) and improvements

All 452 tests pass. Package validates cleanly for pub.dev publication.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• dl-ssl.google.com
  • Triggering command: wget -qO- REDACTED (dns block)
• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[feature] publish the 1.0.0 semantic release</issue_title>
<issue_description>Need to improve the whole repo's code and README and publish the 1.0.0 semantic release </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [feature] publish the 1.0.0 semantic release #60

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