Add environment configuration, enhance Feishu session handling, and implement tests for TLS 1.2 and retry logic

.env.example

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+# PostgreSQL analytics database (required)
+ANALYTICS_DB_HOST=postgres.example.internal
+ANALYTICS_DB_PORT=5432
+ANALYTICS_DB_USER=your_database_user
+ANALYTICS_DB_PASSWORD=your_database_password
+ANALYTICS_DB_NAME=your_database_name
+
+# Feishu application and Bitable (required)
+FEISHU_APP_ID=cli_your_app_id
+FEISHU_APP_SECRET=your_feishu_app_secret
+FEISHU_BASE_URL=https://example.feishu.cn/base/your_app_token
+
+# Sync settings
+PROJECT_MAPPING_FILE=店铺映射表.xlsx
+FEISHU_STORE_FIELD_NAME=店铺名称
+SYNC_START_DATE=2026-04-01
+
+# Feishu notification (optional; configure one or both as needed)
+FEISHU_BOT_WEBHOOK=
+FEISHU_CHAT_ID=
+FEISHU_REPORT_IMAGE_PATH=
+
+# Prefect (required only for Prefect deployment/worker mode)
+PREFECT_API_URL=http://host.docker.internal:4200/api
+PREFECT_SYNC_STATE_FILE=
+
+# Logging (optional)
+LOG_DIR=
+LOG_FILE_NAME=gmv_sync.log
+LOG_LEVEL=INFO
+LOG_MAX_BYTES=10485760
+LOG_BACKUP_COUNT=7