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/__init__.py

@@ -0,0 +1,3 @@
+from config.settings import settings, Settings, load_settings
+
+__all__ = ["settings", "Settings", "load_settings"]

config/settings.py

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+from pathlib import Path
+from typing import Optional
+from sqlalchemy.engine import URL
+from pydantic import BaseModel, Field
+from pydantic_yaml import parse_yaml_raw_as
+
+
+class SqlServerConfig(BaseModel):
+    """SQL Server 连接配置"""
+    host: str
+    port: int = 1433
+    database: str
+    username: str
+    password: str
+    driver: str = "{ODBC Driver 18 for SQL Server}"
+    trust_server_certificate: str = "yes"
+
+
+class DatabaseConfig(BaseModel):
+    """数据库配置"""
+    sql_server: SqlServerConfig
+
+
+class Settings(BaseModel):
+    """应用配置"""
+    database: DatabaseConfig
+
+    @property
+    def database_url(self) -> URL:
+        """构建数据库连接 URL"""
+        conf = self.database.sql_server
+        return URL.create(
+            "mssql+pyodbc",
+            username=conf.username,
+            password=conf.password,
+            host=conf.host,
+            port=conf.port,
+            database=conf.database,
+            query={
+                "driver": conf.driver.strip("{}"),
+                "TrustServerCertificate": conf.trust_server_certificate,
+            },
+        )
+
+
+def load_settings(config_path: str = "config/settings.yaml") -> Settings:
+    """加载 YAML 配置文件"""
+    path = Path(config_path)
+    if not path.exists():
+        raise FileNotFoundError(
+            f"配置文件不存在: {config_path}\n"
+            f"请确保文件存在于项目根目录或指定正确路径"
+        )
+    # Use UTF-8 encoding to avoid Windows GBK encoding issues
+    with open(path, "r", encoding="utf-8") as f:
+        return parse_yaml_raw_as(Settings, f)
+
+
+# 全局配置单例
+settings = load_settings()

config/settings.yaml

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+# 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