客服知识覆盖缺口审计器

1. 1. Copy and redact the authorized source data using examples/input.json as the schema.
2. Run python scripts/audit_kb_coverage.py --input examples/input.json --output examples/output.json.
3. Review the structured result and hand only approved fields to the next workflow step.

只审计脱敏元数据，不抓取网站、不改写知识库；关键词匹配不能替代知识负责人对真实内容的判断。