UPSTREAM PR #21985: Feat/modelscope support

[loci-dev]

Note

Source pull request: ggml-org/llama.cpp#21985

Overview

This PR introduces ModelScope integration for model downloading and loading.
Related PR: ggml-org/llama.cpp#20941

Key changes:

1. Added new cli arguments: -ms (ModelScope repo ID), -msf (file), and -mst (token).
2. Added corresponding environment variables support for seamless configuration.
   Enabled community model downloading via MODEL_ENDPOINT (defaults to https://modelscope.cn/), allowing flexible usage with or without explicit endpoint specification.

Usage examples:

# 1. Download via ModelScope ID (uses default or MODEL_ENDPOINT)
./build/bin/llama-cli -ms Qwen/Qwen3-0.6B-GGUF:Q8_0 -p "hello"
or
MODEL_ENDPOINT=https://modelscope.cn/ ./build/bin/llama-cli -ms Qwen/Qwen3-0.6B-GGUF:Q8_0 -p "hello"

# 2. Specify file and token explicitly (or set 'MS_TOKEN' env)
./build/bin/llama-cli -ms <repo> -msf <file> -mst <token> -p "hello"

Additional information

Requirements

• I have read and agree with the contributing guidelines
• AI usage disclosure: NO

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