Store public Sparkle configuration in Info.plist

[austin-smith]

What Changed

• Stored the public Sparkle feed URL and EdDSA public key directly in BitDream/Info.plist.
• Removed the .xcconfig and local override system.
• Removed the public Sparkle repository-variable dependency from pull request and release builds.
• Kept the Sparkle private signing key in GitHub Secrets.
• Updated the release workflow, release script, and documentation to use the tracked app configuration.

Why

The feed URL and public key are public app metadata and need to be available when fork pull requests build the app. Keeping them in tracked Info.plist makes the app configuration valid in every build and avoids maintaining duplicate values in GitHub variables.

Validation

• Ran 223 macOS tests successfully.
• Built the iOS app successfully.
• Built the macOS Release configuration successfully.
• Verified the built macOS app contains the expected feed URL and a valid 32-byte public key.
• Ran SwiftLint successfully.
• Validated the workflow YAML, plist, release script syntax, and Git diff.

[austin-smith]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 🎉

Reviewed commit: 2ec10d6414

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