feat: add media command (mediaStorage), deprecate upload

[felixsanz]

Adds a media command group backed by the mediaStorage task:

• runware media upload <file|url> — store media, returns mediaUUID + mediaURL
• runware media delete <mediaUUID> — permanently delete stored media

Deprecates the upload command (kept, still works) in favor of media upload, matching the SDK deprecation of imageUpload → mediaStorage. Extracts the shared image-input builder into cmdutil.

[coderabbitai]

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[Copilot]

Pull request overview

This PR introduces a new runware media command group backed by the mediaStorage API task (upload + delete), refactors the shared local-path/URL/data-URI input handling into internal/cmdutil, and marks the legacy runware upload command as deprecated.

Changes:

• Add runware media upload and runware media delete commands wired to Client.MediaStorage.
• Extract the shared image input builder into internal/cmdutil.BuildImageInput with unit tests.
• Deprecate (but keep) runware upload, and update end-user docs to highlight media.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
README.md	Replaces the “Upload” section with “Media”, documenting media upload/delete and noting upload is deprecated.
internal/cmdutil/mediainput.go	New shared helper to turn `<file
internal/cmdutil/mediainput_test.go	Updates and relocates tests to cover cmdutil.BuildImageInput.
internal/cmd/upload/upload.go	Deprecates upload command and switches to using cmdutil.BuildImageInput.
internal/cmd/root.go	Registers the new media command group on the root command.
internal/cmd/media/upload.go	Implements runware media upload (calls MediaStorage(upload, ...)) and prints mediaUUID/mediaURL/taskUUID.
internal/cmd/media/media.go	Defines the media command group and attaches upload/delete subcommands.
internal/cmd/media/delete.go	Implements runware media delete (calls MediaStorage(delete, <uuid>)) and prints mediaUUID/taskUUID.
internal/api/types.go	Adds MediaStorageRequest / MediaStorageResult types for the new task.
internal/api/media_storage_test.go	Adds unit tests validating request construction and response parsing for upload/delete operations.
internal/api/constants.go	Adds taskTypeMediaStorage and operation constants (upload, delete).
internal/api/client.go	Adds Client.MediaStorage and documents UploadImage as superseded.
docs/runware.md	Adds runware media to top-level docs list (but removes runware upload entry).
docs/runware_media.md	Adds docs page for the runware media command group.
docs/runware_media_upload.md	Adds docs page for runware media upload.
docs/runware_media_delete.md	Adds docs page for runware media delete.

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[danmrichards]

Linter isn't happy with one of your tests

stale