docs: update README and CLAUDE.md to v2.2.0

- Added documentation for audit tracking (IP address, invocation method).
- Updated database model descriptions for enhanced WorkOrder and Conversation fields.
- Documented the new UnifiedConfig system.
- Reflected enhanced logging transparency for knowledge base parsing.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/core/models.py

@@ -66,6 +66,8 @@ class Conversation(Base):
     confidence_score = Column(Float)
     knowledge_used = Column(Text)  # 使用的知识库条目
     response_time = Column(Float)  # 响应时间（秒）
+    ip_address = Column(String(45), nullable=True)  # IP地址
+    invocation_method = Column(String(50), nullable=True)  # 调用方式（websocket, api等）
 
     work_order = relationship("WorkOrder", back_populates="conversations")