feat: Update database setup and download handling

- Set a fixed database password and ensure old data is overwritten during setup.
- Enhance the download functionality with improved error handling for missing files, providing user-friendly HTML responses.
- Add instructions for placing client builds in the downloads directory in the admin panel.

install.sh

@@ -99,19 +99,23 @@ install_nodejs() {
     fi
 }
 
-# 配置数据库
+# 配置数据库（固定密码 12345678，安装时覆盖旧数据）
 setup_database() {
     echo -e "${YELLOW}[4/7] 配置数据库...${NC}"
     
     systemctl enable postgresql
     systemctl start postgresql
     
-    # 生成随机密码
-    DB_PASSWORD=$(openssl rand -base64 32 | tr -dc 'a-zA-Z0-9' | head -c 24)
+    # 固定数据库密码，安装时覆盖旧库与用户
+    DB_PASSWORD="12345678"
     
-    # 创建数据库和用户
-    sudo -u postgres psql -c "CREATE USER funmc WITH PASSWORD '$DB_PASSWORD';" 2>/dev/null || true
-    sudo -u postgres psql -c "CREATE DATABASE funmc OWNER funmc;" 2>/dev/null || true
+    # 先删除旧数据库和用户（覆盖旧数据）
+    sudo -u postgres psql -c "DROP DATABASE IF EXISTS funmc;" 2>/dev/null || true
+    sudo -u postgres psql -c "DROP USER IF EXISTS funmc;" 2>/dev/null || true
+    
+    # 创建用户和数据库
+    sudo -u postgres psql -c "CREATE USER funmc WITH PASSWORD '$DB_PASSWORD';"
+    sudo -u postgres psql -c "CREATE DATABASE funmc OWNER funmc;"
     sudo -u postgres psql -c "GRANT ALL PRIVILEGES ON DATABASE funmc TO funmc;"
     
     # 配置 pg_hba.conf
@@ -122,7 +126,7 @@ setup_database() {
         systemctl reload postgresql
     fi
     
-    echo -e "${GREEN}✓ 数据库配置完成${NC}"
+    echo -e "${GREEN}✓ 数据库配置完成（密码已设为 12345678，已覆盖旧数据）${NC}"
     echo "$DB_PASSWORD" > /tmp/funmc_db_password
 }
 
@@ -130,8 +134,8 @@ setup_database() {
 build_funmc() {
     echo -e "${YELLOW}[5/7] 编译 FunMC...${NC}"
     
-    # 创建目录
-    mkdir -p $INSTALL_DIR $CONFIG_DIR $DATA_DIR $LOG_DIR
+    # 创建目录（含客户端下载目录）
+    mkdir -p $INSTALL_DIR $INSTALL_DIR/downloads $CONFIG_DIR $DATA_DIR $LOG_DIR
     
     # 克隆或更新代码
     if [ -d "$INSTALL_DIR/src" ]; then
@@ -192,6 +196,7 @@ ADMIN_PASSWORD=${ADMIN_PASSWORD}
 # 客户端下载
 CLIENT_DOWNLOAD_ENABLED=true
 CLIENT_VERSION=${FUNMC_VERSION}
+DOWNLOADS_DIR=$INSTALL_DIR/downloads
 EOF
 
     # 创建中继配置