Replaced usage of `json.Decoder` with `json.Unmarshal` to fix newline handling in JSON strings by escaping newlines. This ensures proper parsing and prevents errors with multiline fields in mod descriptions.

Introduce a Dockerfile for building the Golang application into a container image, and a GitLab CI configuration for automated multi-architecture builds. The CI pipeline supports caching and pushes the resulting images for arm64 and amd64 platforms to the registry.

Set up a new Go module for the project, specifying Go version 1.24.1. Added direct dependencies `go-arg` and `zerolog`, along with necessary indirect dependencies to the `go.mod` and `go.sum` files.

Implemented a Go-based utility to index and bundle mods for the Granite launcher, supporting client and server configurations. Replaced the README content with usage instructions and configuration guidelines in Russian, reflecting the new functionality.