Update deprecated huggingface-cli to hf command in documentation

[Copilot]

The huggingface-cli download command is deprecated in favor of hf download. Updated all documentation under docs/ to use the current command syntax.

Changes

• 10 files updated: 5 English (docs/en/examples/) and 5 Chinese (docs/zh/examples/) markdown files
• 18 command occurrences replaced across model download examples (DeepSeek-R1, GLM-4.5, GLM-Z1-9B, Qwen3-4B, Qwen3-30B-A3B) and dataset downloads (dapo-math-17k, aime-2024)

Example change:

# Before
huggingface-cli download Qwen/Qwen3-4B --local-dir /root/Qwen3-4B

# After
hf download Qwen/Qwen3-4B --local-dir /root/Qwen3-4B

Original prompt

for *.md and *.rst under docs/, please update huggingface-cli download to hf download as the huggingface-cli command is deprecated.

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.