docs: add .env.example template for environment configuration

Co-Authored-By: Claude (glm-5) <noreply@anthropic.com>

.env.example

@@ -0,0 +1,59 @@
+# ===========================
+# ERP 系统配置
+# ===========================
+ERP_URL=https://example.com:8082/
+ERP_USERNAME=your_username
+ERP_PASSWORD=your_password
+ERP_HEADLESS=true
+ERP_IGNORE_HTTPS_ERRORS=true
+ERP_AUTO_CLOSE_BROWSER=true
+
+# ===========================
+# 数据库配置 - SQL Server
+# ===========================
+DB_TYPE=sqlserver
+DB_SERVER=192.168.1.100
+DB_NAME=YourDatabase
+DB_USERNAME=your_db_username
+DB_PASSWORD=your_db_password
+DB_SQLSERVER_DRIVER=ODBC Driver 18 for SQL Server
+DB_TRUST_SERVER_CERTIFICATE=yes
+
+# ===========================
+# 数据库配置 - MySQL (切换时使用)
+# ===========================
+# DB_TYPE=mysql
+# DB_NAME=your_mysql_db
+# DB_USERNAME=your_mysql_username
+# DB_PASSWORD=your_mysql_password
+DB_MYSQL_HOST=192.168.1.100
+DB_MYSQL_PORT=3306
+DB_MYSQL_CHARSET=utf8mb4
+
+# ===========================
+# 路径配置
+# ===========================
+PATH_DATA_DIR=/path/to/your/data
+PATH_PRODUCTION_ID_FILE=ProductionID.txt
+PATH_DEFAULT_OUTPUT=离散备料计划维护_合并.xlsx
+PATH_VALIDATION_OUTPUT=物料状态校验结果.xlsx
+
+# ===========================
+# 数据提取配置
+# ===========================
+EXTRACTION_BATCH_SIZE=100
+EXTRACTION_VERBOSE=true
+EXTRACTION_AUTO_CONVERT=true
+EXTRACTION_MERGE_BATCHES=true
+EXTRACTION_ENABLE_DB_PERSISTENCE=true
+
+# ===========================
+# 校验配置
+# ===========================
+VALIDATION_DATA_SOURCE=database_full
+VALIDATION_USE_DATABASE=true
+VALIDATION_BATCH_SIZE=2000
+VALIDATION_ENABLE_CRUD=false
+VALIDATION_DEFAULT_MANAGER=
+VALIDATION_MATCH_MODE=substring
+EXECUTION_DRYRUN=true