chore: remove settings.yaml from tracking and add to .gitignore

Contains database credentials, should not be versioned.

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

config/settings.yaml

@@ -1,10 +0,0 @@
-# 数据库配置
-database:
-  sql_server:
-    host: 192.168.110.114
-    port: 1433
-    database: CompanyDB
-    username: peng
-    password: Cqbld123456.
-    driver: "{ODBC Driver 18 for SQL Server}"
-    trust_server_certificate: yes