Allow image assets download from email

[frankdekker]

Give access to image assets for images send via email

[Copilot]

Pull Request Overview

This PR adds secure image asset download functionality from emails by implementing a hash-based authorization mechanism. It allows public access to assets with a valid hash parameter while maintaining security through hash verification.

• Implements a new AssetVoter for hash-based authorization
• Adds public access to asset routes with proper security controls
• Updates asset URLs to include secure hash parameters

Reviewed Changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/Security/Voter/AssetVoter.php	New voter implementing hash-based authorization for asset access
src/Entity/Asset/Asset.php	Adds getHash() method to generate SHA-256 hash of asset data
src/Controller/App/Asset/GetAssetController.php	Updates authorization to allow public access with valid hash
src/Controller/App/Asset/AddAssetController.php	Includes hash parameter in generated asset URLs
config/packages/security.php	Configures public access for asset routes
tests/Unit/Security/Voter/AssetVoterTest.php	Comprehensive test coverage for AssetVoter functionality
tests/Unit/Entity/Asset/AssetTest.php	Tests hash generation method
tests/Unit/Controller/App/Asset/AddAssetControllerTest.php	Updates test to include hash in URL generation
AGENTS.md	Corrects filename in markdown header
.github/copilot-instructions.md	Adds comprehensive project documentation

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.98%. Comparing base (ceacf52) to head (51adf2c).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1211   +/-   ##
=========================================
  Coverage     99.98%   99.98%           
- Complexity     3350     3357    +7     
=========================================
  Files           582      583    +1     
  Lines          9935     9945   +10     
=========================================
+ Hits           9934     9944   +10     
  Misses            1        1           

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