feat(serverless): initial command structure scaffolding

[Ryank90]

Scaffolding out the serverless product structure.

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[Copilot]

Pull request overview

This PR scaffolds an initial “serverless” command group in the Runware CLI, introducing a dedicated Serverless REST client, wiring the command into the root CLI, and generating initial reference docs.

Changes:

• Added Serverless API/Dashboard base URL configuration helpers and environment overrides.
• Introduced a new internal/api/serverless REST client and a first endpoint (ListGpuTypes) with tests.
• Added a new runware serverless command group with initial subcommands (deploy, gpus, open) plus generated docs.

Reviewed changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
internal/config/config.go	Adds defaults + env overrides for Serverless API and dashboard URLs.
internal/cmdutil/browser.go	Adds a helper to open URLs in the default browser cross-platform.
internal/cmd/serverless/serverless.go	Registers the serverless command group and its subcommands.
internal/cmd/serverless/secret.go	Adds placeholder serverless apps secret command group.
internal/cmd/serverless/registry.go	Adds placeholder serverless registry command group.
internal/cmd/serverless/open.go	Adds serverless open command to open dashboard URLs and print the link.
internal/cmd/serverless/gpus.go	Adds serverless gpus command to fetch and render GPU catalogue + pricing.
internal/cmd/serverless/deploy.go	Adds serverless deploy command stub (currently unimplemented).
internal/cmd/serverless/apps.go	Adds placeholder serverless apps group and wires in secret.
internal/cmd/root.go	Wires serverless into the root CLI command tree.
internal/api/serverless/types.go	Defines Serverless GPU-related response types.
internal/api/serverless/gpu.go	Implements ListGpuTypes endpoint call.
internal/api/serverless/gpu_test.go	Adds tests for ListGpuTypes and error/auth behaviors.
internal/api/serverless/errors.go	Adds error parsing/mapping to shared transport.RunwareError.
internal/api/serverless/client.go	Adds a minimal REST client with auth + JSON decode + debug logging.
docs/runware.md	Adds runware serverless to the top-level command documentation.
docs/runware_serverless.md	Adds generated docs page for the serverless command group.
docs/runware_serverless_open.md	Adds generated docs page for serverless open.
docs/runware_serverless_gpus.md	Adds generated docs page for serverless gpus.
docs/runware_serverless_deploy.md	Adds generated docs page for serverless deploy.

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[danmrichards]

Lets also have this target a new rc/serverless or something similar. We don't want to have this in a production build just yet, so merging to main would prevent us pushing out any other fixes/features. Alternatively we'd need to have some build time killswitch for these commands.