feat: add MySQL database support with SQL translation

- Add MySQLConnection class with automatic SQL Server to MySQL translation
- Add connection factory to support both SQL Server and MySQL
- Update config schema to support MySQL configuration (host, port, db_type)
- Update default config to use MySQL (localhost:3306)
- Translate table names: [schema].[table] -> schema_table
- Translate placeholders: ? -> %s
- Translate MERGE statements to INSERT ... ON DUPLICATE KEY UPDATE

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

config/defaults.py

@@ -26,12 +26,16 @@ DEFAULT_APP_CONFIG = AppConfig(
         auto_close_browser=True,
     ),
     database=DatabaseConfig(
-        server="192.168.110.114",
+        db_type="mysql",
+        host="localhost",
+        port=3306,
         database="CompanyDB",
-        username="peng",
-        password="Cqbld123456.",
-        driver="ODBC Driver 18 for SQL Server",
-        trust_server_certificate="yes",
+        username="remote_user",
+        password="3.1415926Beeke",
+        # SQL Server fields (not used in MySQL mode)
+        server="",
+        driver="",
+        trust_server_certificate="",
     ),
     paths=PathConfig(
         data_dir="D:/python/playwrite/data/",
@@ -59,3 +63,49 @@ DEFAULT_APP_CONFIG = AppConfig(
 
 # 兼容旧版本的字典格式
 DEFAULT_SETTINGS_DICT = DEFAULT_APP_CONFIG.to_dict()
+
+
+# MySQL 配置示例（使用时取消注释并注释掉上面的 DEFAULT_APP_CONFIG）
+# MYSQL_APP_CONFIG = AppConfig(
+#     erp=ERPConfig(
+#         url="https://68.11.34.30:8082/",
+#         username="BLDpengqiangqiang",
+#         password="Cqbld123456.",
+#         headless=True,
+#         ignore_https_errors=True,
+#         auto_close_browser=True,
+#     ),
+#     database=DatabaseConfig(
+#         db_type="mysql",
+#         host="localhost",
+#         port=3306,
+#         database="CompanyDB",
+#         username="mysql_user",
+#         password="mysql_password",
+#         # SQL Server 字段（MySQL 模式下不使用）
+#         server="",
+#         driver="",
+#         trust_server_certificate="",
+#     ),
+#     paths=PathConfig(
+#         data_dir="D:/python/playwrite/data/",
+#         production_id_file="ProductionID.txt",
+#         default_output="离散备料计划维护_合并.xlsx",
+#         validation_output="物料状态校验结果.xlsx",
+#     ),
+#     extraction=ExtractionConfig(
+#         batch_size=100,
+#         verbose=True,
+#         auto_convert=True,
+#         merge_batches=True,
+#         enable_db_persistence=False,
+#     ),
+#     validation=ValidationConfig(
+#         data_source="database_full",
+#         use_database=True,
+#         batch_size=2000,
+#         enable_crud_operations=False,
+#         default_manager="",
+#         match_mode="substring",
+#     ),
+# )