refactor: manage upscaler params through model manager

[leejet]

Summary

• Route ESRGAN and LTX latent upsampler parameter loading through ModelManager instead of runner-local loading.
• Add ESRGAN tensor name conversion via VERSION_ESRGAN and canonical name mapping for RealESRGAN-style weights.
• Move ESRGAN and LTX latent upsampler config detection into their Config::detect_from_weights paths and initialize runners from metadata in constructors.

Related Issue / Discussion

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Additional Information

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Checklist

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