chore: improved snapshot features SoC

[petruki]

This pull request replaces snapshot_lifecycle with segregated exclusive and independent features for watching snapshot files, updating and loading.

Snapshot Auto-Update Feature:

• Added a new snapshot_auto_updater.go module, which implements a background goroutine to periodically check for and apply remote snapshot updates, with scheduling and termination controls.
• Exposed new public functions ScheduleSnapshotAutoUpdate and TerminateSnapshotAutoUpdate to control auto-updating, both globally and on a per-client basis.
• Added comprehensive tests for the auto-update mechanism in snapshot_auto_updater_test.go, covering scheduling, callback invocation, update application, and termination.

Remote API Integration and Client Enhancements:

• Implemented new client methods CheckSnapshot, checkSnapshotVersion, and resolveSnapshot to interact with remote endpoints for snapshot status checking and retrieval. Added relevant response types and improved error handling for remote operations. [1] [2] [3]
• Added utility methods to client.go for determining when to check snapshots and for loading snapshots from files.

Testing and Cleanup:

• Removed obsolete or redundant snapshot loading tests from local_test.go to streamline the test suite in light of the new auto-update logic.

Development Environment and Build Improvements:

• Added a fmt command to the Makefile for code formatting and updated .PHONY targets. [1] [2]
• Updated the base Alpine Linux version in .devcontainer/Dockerfile and renamed the main service in docker-compose.yml for clarity. [1] [2]

Miscellaneous:

• Minor import and formatting adjustments for improved code quality and maintainability.

Overall, these changes introduce a robust, test-covered mechanism for keeping client snapshots up-to-date automatically, while also improving developer ergonomics and code structure.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud