引入 cwe 中文词典，README.cn.md 采用中文翻译；如果没有，就用英文。 #2

feat(cwe): add Chinese CWE name dictionary for README.cn.md

fix(cwe.zh): guard against empty catalog when cwe.org.cn is unreachable

docs: replace doc/ with docs/ — 7 numbered, summary-first articles

docs(readme+docs/0): drop the unsupportable '25 years' claim

feat(cwe): add Top 10 by avg CVSS score since 2025

feat(cwe): add Chinese CWE name dictionary for README.cn.md

fix(cwe.zh): guard against empty catalog when cwe.org.cn is unreachable

docs: replace doc/ with docs/ — 7 numbered, summary-first articles

docs(readme+docs/0): drop the unsupportable '25 years' claim