feat: add YAML configuration module with pydantic-yaml

- Created config directory with settings.py, __init__.py, and settings.yaml
- Implemented SqlServerConfig and DatabaseConfig classes for SQL Server connections
- Added Settings class with database_url property for SQLAlchemy URL construction
- Uses parse_yaml_raw_as for UTF-8 safe YAML loading on Windows
- Configuration validated successfully via import test

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

config/settings.yaml

@@ -0,0 +1,10 @@
+# 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