build: upgrade Dart SDK and dependencies

[mrverdant13]

Details

Upgrade Dart SDK and dependencies

[Copilot]

Pull Request Overview

This PR upgrades the Dart SDK constraint from 3.0.0 to 3.5.0 and updates all package dependencies to their latest compatible versions, along with upgrading the Melos build tool.

• Dart SDK minimum version bumped from 3.0.0 to 3.5.0 across all packages
• Melos upgraded from 6.1.0 to 7.1.0 with configuration migrated from separate melos.yaml to integrated pubspec.yaml
• Multiple package dependencies updated to newer versions (args, collection, html, io, meta, path, process, build, etc.)

Reviewed Changes

Copilot reviewed 9 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pubspec.yaml	Updated Dart SDK constraint and Melos version; migrated Melos configuration from separate file
packages/*/pubspec.yaml	Updated Dart SDK constraints and dependency versions across all packages
melos.yaml	Removed as configuration moved to main pubspec.yaml
CONTRIBUTING.md	Updated documentation to reflect new minimum versions
.github/workflows/ci.yaml	Updated CI workflow to use new Melos and coverage tool versions
packages/coverde_cli/CHANGELOG.md	Added changelog entry for Dart 3.5.0 upgrade

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