Use openapi-driven types for ComfyUI-Manager API

[christian-byrne]

• Switch to openapi-driven development for ComfyUI-Manager service/gateway code, as it is currently done for the Comfy Registry (using workflow here https://github.com/Comfy-Org/ComfyUI_frontend/blob/main/.github/workflows/update-registry-types.yaml)
• Then all the types that are manually written in this file should be removed/adapted and the modules depending on that file should be refactored to import the generated types instead.

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