[mesheryctl] Populate generated model definitions with the requested model name

See mesheryctl Command Tracker for current status of commands.

Current Behavior

mesheryctl model init scaffolds the directory structure, but it leaves a TODO in code for inserting the requested model name into the generated model definition.

As a result, users still have to perform an immediate manual edit in the primary generated file before the scaffold feels complete.

Desired Behavior

The generated model.json / model.yaml should already contain the requested model name so that the scaffold is closer to being ready-to-edit out of the box.

Implementation

Relevant code path:

• mesheryctl/internal/cli/root/model/init.go
• trailing TODO: put a model name into generated model file

Acceptance Tests

• Running mesheryctl model init my-model should emit a generated model definition whose name field is already my-model.
• Both JSON and YAML outputs should receive the requested name.
• Existing scaffold generation tests should cover the populated name field.

Mockups

N/A

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