[Feature] Implement Alpha/Beta Release Channels

[4cecoder]

Feature Description

Implement alpha and beta release channels with proper update system integration.

Problem Statement

Current release process doesn't support alpha and beta channels. All releases go to "latest" pre-release tag, making it hard to manage different user cohorts.

Proposed Solution

1. Add alpha channel (for early adopters, risky features)
2. Add beta channel (for testing before stable release)
3. Keep stable channel for production releases
4. Integrate update system with official builds only
5. Use version tags: v{version}-alpha, v{version}-beta, v{version}

Acceptance Criteria

• Alpha release workflow configured
• Beta release workflow configured
• Update system checks for appropriate channel
• Alpha builds tagged with v{version}-alpha
• Beta builds tagged with v{version}-beta
• Stable builds tagged with v{version}
• Documentation updated
• Test releases for all channels

Priority

critical

Component

android