Update deprecated huggingface-cli and fix broken links

[Lyken17]

Update deprecated huggingface-cli

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

Fix Outdated Links and Hyperrefs in docs/

Project Reference:

• docs/README.md: "SGLang codebase" → "slime codebase"

RST References:

• docs/zh/index.rst: "fault-tolerance.md" → "fault-torlance.md" (matching actual filename)

Internal Documentation Links:

• docs/en/get_started/quick_start.md: "models/" → "../examples/" (2 links)
• docs/zh/get_started/quick_start.md: "models/" → "../examples/" (2 links)
• docs/en/examples/qwen3-4b-base-openhermes.md: "./models/qwen3-4B.md" → "qwen3-4B.md"
• docs/zh/examples/qwen3-4b-base-openhermes.md: "./models/qwen3-4B.md" → "qwen3-4B.md"

Repository Root References:

• docs/en/examples/qwen3-4b-base-openhermes.md: Script paths "../../" → "../../../" (2 links)
• docs/zh/examples/qwen3-4b-base-openhermes.md: Script paths "../../" → "../../../" (2 links)
• docs/en/get_started/usage.md: Repository paths "../../" → "../../../" (7 links)
• docs/zh/get_started/usage.md: Repository paths "../../" → "../../../" (7 links)

Cross-Directory Links:

• docs/en/get_started/qa.md: "./debug.md" → "../developer_guide/debug.md"
• docs/zh/get_started/qa.md: "./debug.md" → "../developer_guide/debug.md"

Sphinx/MyST Compatibility:

• docs/{en,zh}/examples/*.md: Remove "./" prefix from same-directory links (8 files, 8 links)
  • Fixed: ./qwen3-4B.md → qwen3-4B.md
  • Affected files: deepseek-r1.md, glm4.5-355B-A32B.md, qwen3-30B-A3B.md, qwen3-4b-base-openhermes.md (both en and zh)

GitHub Direct Links for Scripts and Python Files:

• Replace all relative paths to .sh and .py files with GitHub repository URLs (15 files, 27 links)
  • Pattern: ../../../scripts/*.sh → https://github.com/THUDM/slime/blob/main/scripts/*.sh
  • Pattern: ../../../slime/**/*.py → https://github.com/THUDM/slime/blob/main/slime/**/*.py
  • Pattern: ../../../train.py → https://github.com/THUDM/slime/blob/main/train.py
  • Pattern: ../../../scripts/models/ → https://github.com/THUDM/slime/tree/main/scripts/models/
  • Examples: run-qwen3-4B.sh, run-qwen3-4B-base-sft.sh, sglang_rollout.py, train.py, arguments.py, types.py