refactor: simplify deployment - unified env and startup script

- Remove Docker deployment files (1panel doesn't use Docker)
- Unify .env files: .env.example -> .env (single config file)
- Merge start.sh and start-prod.sh into unified start.sh with --prod flag
- Update setup_dev_env.sh to use .env instead of .env.local
- Add DEPLOY.md with 1panel deployment guide

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

setup_dev_env.sh

@@ -227,17 +227,17 @@ init_database() {
     echo "初始化數據庫..."
     cd "$SCRIPT_DIR/backend"
 
-    # 檢查 .env.local 是否存在
-    if [ ! -f "$SCRIPT_DIR/.env.local" ]; then
-        print_warning "未找到 .env.local，跳過數據庫初始化"
-        echo "  請複製 .env.example 到 .env.local 並配置後，手動執行:"
+    # 檢查 .env 是否存在
+    if [ ! -f "$SCRIPT_DIR/.env" ]; then
+        print_warning "未找到 .env，跳過數據庫初始化"
+        echo "  請複製 .env.example 到 .env 並配置後，手動執行:"
         echo "  cd backend && alembic upgrade head"
         cd "$SCRIPT_DIR"
         return
     fi
 
     # 載入環境變量
-    export $(grep -v '^#' "$SCRIPT_DIR/.env.local" | xargs)
+    export $(grep -v '^#' "$SCRIPT_DIR/.env" | xargs)
 
     # 執行遷移
     if alembic upgrade head 2>/dev/null; then
@@ -414,8 +414,8 @@ echo ""
 echo "下一步操作："
 echo ""
 echo "1. 配置環境變量 (如尚未配置):"
-echo "   cp .env.example .env.local"
-echo "   # 編輯 .env.local 填入實際配置"
+echo "   cp .env.example .env"
+echo "   # 編輯 .env 填入實際配置"
 echo ""
 echo "2. 啟動應用:"
 echo "   ./start.sh              # 同時啟動前後端"