fix: 设置默认账号为 demo/demo123，修复数据路径

问题修复:
1. ✅ 默认账号设置
   - db.rs: 默认密码改为 demo123
   - .env.template: 默认密码改为 demo123
   - install.sh: 默认密码改为 demo123

2. ✅ 数据路径动态化
   - db.rs: 使用 dirs::home_dir() 自动检测用户主目录
   - 默认路径: {HOME}/momentry_studio/data/users
   - 支持通过 MOMENTRY_DATA_DIR 环境变量自定义

验证脚本:
- scripts/verify_default_setup.sh: 验证默认账号和数据路径

目标:
- 安装后可直接使用 demo/demo123 登录
- 数据路径随用户主目录自动调整
- 适用于任何用户环境

影响:
- demo 用户: 密码固定为 demo123
- 数据路径: 自动检测 {HOME}/momentry_studio/data/users
- 安装即可使用，无需额外配置

.env.template

@@ -61,9 +61,9 @@ MOMENTRY_API_KEY=your_momentry_api_key_here
 # ========================================
 # 默认用户密码
 # ========================================
-# 在安装时自动生成，或手动设置
+# 默认密码: demo123
-# 格式: demo_<random>
+# 可自定义修改
-MOMENTRY_DEFAULT_PASSWORD=demo_change_this
+MOMENTRY_DEFAULT_PASSWORD=demo123
 
 # ========================================
 # SMB 共享配置

install.sh

@@ -124,19 +124,33 @@ echo ""
 # 步骤 5.5: 初始化默认用户
 log_step "步骤 5.5/6: 初始化默认用户..."
 
-# Generate a secure random password
+# Use demo123 as default password (can be overridden by MOMENTRY_DEFAULT_PASSWORD)
-DEFAULT_PASSWORD="demo_$(openssl rand -hex 4)"
+DEFAULT_PASSWORD="demo123"
+
+# Check if custom password is set
+if [ -n "${MOMENTRY_DEFAULT_PASSWORD}" ]; then
+    DEFAULT_PASSWORD="${MOMENTRY_DEFAULT_PASSWORD}"
+    log_info "使用自定义密码: ${DEFAULT_PASSWORD}"
+else
+    log_info "使用默认密码: demo123"
+fi
 
 # Set environment variable for password
 export MOMENTRY_DEFAULT_PASSWORD="${DEFAULT_PASSWORD}"
 
-log_info "默认用户密码: ${DEFAULT_PASSWORD}"
+log_info "========================================"
-log_warn "请妥善保存此密码！"
+log_info "默认用户账号:"
+log_info "  用户名: demo"
+log_info "  密码: ${DEFAULT_PASSWORD}"
+log_info "========================================"
+log_warn "安装完成后请立即修改密码！"
 
 # Save to .env file
 if [ -f "${SCRIPT_DIR}/.env" ]; then
+    # Remove old password if exists
+    sed -i.bak '/MOMENTRY_DEFAULT_PASSWORD/d' "${SCRIPT_DIR}/.env"
     echo "" >> "${SCRIPT_DIR}/.env"
-    echo "# Default user password (generated during installation)" >> "${SCRIPT_DIR}/.env"
+    echo "# Default user password" >> "${SCRIPT_DIR}/.env"
     echo "MOMENTRY_DEFAULT_PASSWORD=${DEFAULT_PASSWORD}" >> "${SCRIPT_DIR}/.env"
     log_info "✅ 密码已保存到 .env 文件"
 fi

scripts/verify_default_setup.sh

@@ -0,0 +1,210 @@
+#!/bin/bash
+# 验证默认账号和数据路径
+
+echo "================================================================================
+                    默认账号和数据路径验证
+================================================================================
+"
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
+
+echo "项目根目录: ${PROJECT_ROOT}"
+echo ""
+
+# 1. 检查默认账号
+echo "1. 检查默认账号设置"
+echo "--------------------------------------------------------------------------------"
+
+# 检查 db.rs
+if grep -q '"demo123"' "${PROJECT_ROOT}/src-tauri/src/db.rs"; then
+    echo "✅ db.rs: 默认密码设置为 demo123"
+else
+    echo "❌ db.rs: 默认密码未设置为 demo123"
+fi
+
+# 检查 .env.template
+if grep -q "MOMENTRY_DEFAULT_PASSWORD=demo123" "${PROJECT_ROOT}/.env.template"; then
+    echo "✅ .env.template: 默认密码设置为 demo123"
+else
+    echo "❌ .env.template: 默认密码未设置为 demo123"
+fi
+
+# 检查 install.sh
+if grep -q 'DEFAULT_PASSWORD="demo123"' "${PROJECT_ROOT}/install.sh"; then
+    echo "✅ install.sh: 默认密码设置为 demo123"
+else
+    echo "❌ install.sh: 默认密码未设置为 demo123"
+fi
+
+echo ""
+
+# 2. 检查数据路径
+echo "2. 检查数据路径设置"
+echo "--------------------------------------------------------------------------------"
+
+# 检查 db.rs 是否使用动态路径
+if grep -q 'dirs::home_dir()' "${PROJECT_ROOT}/src-tauri/src/db.rs"; then
+    echo "✅ db.rs: 使用动态路径 (dirs::home_dir())"
+else
+    echo "❌ db.rs: 未使用动态路径"
+fi
+
+# 检查 db.rs 是否使用绝对路径
+if grep -q 'momentry_studio/data/users' "${PROJECT_ROOT}/src-tauri/src/db.rs"; then
+    echo "✅ db.rs: 使用绝对路径 (momentry_studio/data/users)"
+else
+    echo "❌ db.rs: 未使用绝对路径"
+fi
+
+# 检查 paths.rs 是否存在
+if [ -f "${PROJECT_ROOT}/src-tauri/src/paths.rs" ]; then
+    echo "✅ paths.rs: 存在"
+    
+    # 检查关键函数
+    if grep -q 'pub fn get_home_dir()' "${PROJECT_ROOT}/src-tauri/src/paths.rs"; then
+        echo "   ✅ get_home_dir() 函数存在"
+    fi
+    
+    if grep -q 'pub fn get_momentry_core_root()' "${PROJECT_ROOT}/src-tauri/src/paths.rs"; then
+        echo "   ✅ get_momentry_core_root() 函数存在"
+    fi
+else
+    echo "❌ paths.rs: 不存在"
+fi
+
+echo ""
+
+# 3. 检查环境变量
+echo "3. 检查环境变量模板"
+echo "--------------------------------------------------------------------------------"
+
+if [ -f "${PROJECT_ROOT}/.env.template" ]; then
+    echo "✅ .env.template 存在"
+    
+    # 检查关键环境变量
+    if grep -q "MOMENTRY_DATA_DIR=" "${PROJECT_ROOT}/.env.template"; then
+        echo "   ✅ MOMENTRY_DATA_DIR 配置存在"
+    fi
+    
+    if grep -q "MOMENTRY_CORE_ROOT=" "${PROJECT_ROOT}/.env.template"; then
+        echo "   ✅ MOMENTRY_CORE_ROOT 配置存在"
+    fi
+    
+    if grep -q "STORAGE_ROOT=" "${PROJECT_ROOT}/.env.template"; then
+        echo "   ✅ STORAGE_ROOT 配置存在"
+    fi
+else
+    echo "❌ .env.template 不存在"
+fi
+
+echo ""
+
+# 4. 模拟安装测试
+echo "4. 模拟安装测试"
+echo "--------------------------------------------------------------------------------"
+
+# 检测当前用户
+CURRENT_USER=$(whoami)
+USER_HOME=$(eval echo ~${CURRENT_USER})
+
+echo "当前用户: ${CURRENT_USER}"
+echo "用户主目录: ${USER_HOME}"
+echo ""
+
+# 预期的数据路径
+EXPECTED_DATA_DIR="${USER_HOME}/momentry_studio/data/users"
+
+echo "预期数据路径: ${EXPECTED_DATA_DIR}"
+
+# 检查是否存在数据库
+if [ -d "${EXPECTED_DATA_DIR}" ]; then
+    echo "✅ 数据目录存在: ${EXPECTED_DATA_DIR}"
+    
+    if [ -f "${EXPECTED_DATA_DIR}/demo.sqlite" ]; then
+        echo "   ✅ demo.sqlite 存在"
+        
+        # 检查用户表
+        sqlite3 "${EXPECTED_DATA_DIR}/demo.sqlite" "SELECT username FROM app_users WHERE username='demo';" 2>/dev/null && {
+            echo "   ✅ demo 用户存在于数据库中"
+        } || {
+            echo "   ⚠️  demo 用户不存在于数据库中"
+        }
+    else
+        echo "   ⚠️  demo.sqlite 不存在"
+    fi
+else
+    echo "⚠️  数据目录不存在: ${EXPECTED_DATA_DIR}"
+    echo "   安装后将自动创建"
+fi
+
+echo ""
+
+# 5. 总结
+echo "================================================================================
+                            验证总结
+================================================================================
+"
+
+ISSUES=0
+
+# 检查默认账号
+if grep -q '"demo123"' "${PROJECT_ROOT}/src-tauri/src/db.rs" && \
+   grep -q "MOMENTRY_DEFAULT_PASSWORD=demo123" "${PROJECT_ROOT}/.env.template" && \
+   grep -q 'DEFAULT_PASSWORD="demo123"' "${PROJECT_ROOT}/install.sh"; then
+    echo "✅ 默认账号设置正确"
+    echo "   用户名: demo"
+    echo "   密码: demo123"
+else
+    echo "❌ 默认账号设置有问题"
+    ISSUES=$((ISSUES + 1))
+fi
+
+echo ""
+
+# 检查数据路径
+if grep -q 'dirs::home_dir()' "${PROJECT_ROOT}/src-tauri/src/db.rs" && \
+   grep -q 'momentry_studio/data/users' "${PROJECT_ROOT}/src-tauri/src/db.rs"; then
+    echo "✅ 数据路径使用动态路径"
+    echo "   自动检测用户主目录: ${USER_HOME}"
+    echo "   数据路径: ${EXPECTED_DATA_DIR}"
+else
+    echo "❌ 数据路径未使用动态路径"
+    ISSUES=$((ISSUES + 1))
+fi
+
+echo ""
+
+if [ $ISSUES -eq 0 ]; then
+    echo "================================================================================
+                    ✅ 所有检查通过
+================================================================================
+"
+    echo "准备状态:"
+    echo "  ✅ 默认账号: demo / demo123"
+    echo "  ✅ 数据路径: 自动检测用户主目录"
+    echo "  ✅ 可安装到任何系统"
+    echo ""
+    echo "下一步:"
+    echo "  1. 运行安装: ./scripts/install.sh"
+    echo "  2. 验证安装: ./scripts/check_user_isolation.sh"
+    echo "  3. 测试登录: 用户名 demo, 密码 demo123"
+else
+    echo "================================================================================
+                    ❌ 发现 ${ISSUES} 个问题
+================================================================================
+"
+    echo "需要修复的问题:"
+    
+    if ! grep -q '"demo123"' "${PROJECT_ROOT}/src-tauri/src/db.rs"; then
+        echo "  - db.rs 需要设置默认密码为 demo123"
+    fi
+    
+    if ! grep -q 'dirs::home_dir()' "${PROJECT_ROOT}/src-tauri/src/db.rs"; then
+        echo "  - db.rs 需要使用动态路径"
+    fi
+fi
+
+echo ""
+echo "================================================================================
+"

src-tauri/src/db.rs

@@ -52,9 +52,14 @@ CREATE INDEX IF NOT EXISTS idx_video_marks_file ON video_marks(file_uuid);
 static DB_CONN: Mutex<Option<Connection>> = Mutex::new(None);
 
 fn db_path() -> PathBuf {
-    let base = std::env::var("MOMENTRY_DATA_DIR").unwrap_or_else(|_| "../data/users".to_string());
+    // Use dynamic path based on user home directory
+    let base = std::env::var("MOMENTRY_DATA_DIR").unwrap_or_else(|_| {
+        let home = dirs::home_dir()
+            .expect("Failed to get home directory");
+        format!("{}/momentry_studio/data/users", home.display())
+    });
     std::fs::create_dir_all(&base).ok();
-    PathBuf::from(base).join("demo.sqlite")
+    PathBuf::from(base).join("demo.sqlite")  // TODO: Change to dynamic username
 }
 
 pub fn init_db() -> Result<(), String> {
@@ -66,19 +71,11 @@ pub fn init_db() -> Result<(), String> {
 // Add password_hash column if not exists (migration)
     conn.execute("ALTER TABLE app_users ADD COLUMN password_hash TEXT", []).ok();
 
-    // Get default user credentials from environment or use generated values
+    // Get default user credentials from environment or use demo123 as default
     let default_id = "demo";
     let default_user = "demo";
     let default_password = std::env::var("MOMENTRY_DEFAULT_PASSWORD")
-        .unwrap_or_else(|_| {
+        .unwrap_or_else(|_| "demo123".to_string());  // Default: demo123
-            // Generate a random password if not set
-            use std::time::{SystemTime, UNIX_EPOCH};
-            let timestamp = SystemTime::now()
-                .duration_since(UNIX_EPOCH)
-                .unwrap()
-                .as_secs();
-            format!("demo_{}", timestamp % 1000000)  // demo_123456
-        });
     
     // Check if demo user exists and has password
     let password_hash: Option<String> = conn