Added httpclient

[djthorpe]

This PR adds a new HTTP client package for the FFmpeg API, enabling remote execution of FFmpeg operations via HTTP endpoints. The implementation follows the existing client pattern used in pkg/chromaprint/client.go.

Key changes:

• Created pkg/ffmpeg/httpclient package with Client struct embedding go-client.Client
• Implemented ListAudioChannelLayouts method to fetch audio channel layout information via HTTP
• Integrated client into gomedia CLI tool with optional endpoint configuration via --url flag or GOMEDIA_ENDPOINT environment variable

[Copilot]

Pull request overview

This PR adds a new HTTP client package for the FFmpeg API, enabling remote execution of FFmpeg operations via HTTP endpoints. The implementation follows the existing client pattern used in pkg/chromaprint/client.go.

Key changes:

• Created pkg/ffmpeg/httpclient package with Client struct embedding go-client.Client
• Implemented ListAudioChannelLayouts method to fetch audio channel layout information via HTTP
• Integrated client into gomedia CLI tool with optional endpoint configuration via --url flag or GOMEDIA_ENDPOINT environment variable

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
pkg/ffmpeg/httpclient/client.go	Defines Client struct and New() constructor for creating HTTP clients with endpoint configuration
pkg/ffmpeg/httpclient/opts.go	Defines options pattern infrastructure (opt struct, Opt type, applyOpts function)
pkg/ffmpeg/httpclient/list.go	Implements ListAudioChannelLayouts method for fetching audio channel layouts via HTTP
cmd/gomedia/main.go	Adds Client() method to Globals for lazy HTTP client initialization with debug tracing support
cmd/gomedia/list.go	Updates ListAudioChannelsCommand to use HTTP client when endpoint is configured, falling back to local manager