feat: 完善后端并新增 Vue3 WebUI

后端:
- 修复登录校验、DB 并发(单例+WAL+纯Go sqlite)、会话密钥持久化等核心缺陷
- 新增 Timer CRUD/签到/手动触发、执行日志、仪表盘、驱动元数据等 API
- 统一驱动接口: 带 context 的执行器、真实错误返回、敏感字段掩码、连通性测试
- 补全钉钉执行器; Timer 触发/提醒去重; 配置支持默认值与环境变量覆盖

前端:
- Vite+Vue3+TS+Pinia+Element Plus, 由驱动元数据动态渲染配置表单
- 登录/仪表盘(倒计时环)/定时器/规则/账号/日志/设置页面, 支持暗色模式
- 主题色 #66ccff, 信号波纹 logo, go:embed 单二进制部署

构建: Dockerfile 增加前端构建阶段; 补充各驱动配置文档

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

api/dashboard/dashboard.go

@@ -0,0 +1,80 @@
+// Package dashboard 汇总首页需要的统计数据
+package dashboard
+
+import (
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/ssdomei232/goodBaby/api/response"
+	"github.com/ssdomei232/goodBaby/api/user"
+	"github.com/ssdomei232/goodBaby/handler/db"
+	"github.com/ssdomei232/goodBaby/model"
+)
+
+// HandleGetOverview 返回首页概览：各类对象数量、最紧急的 Timer、最近的执行日志
+func HandleGetOverview(c *gin.Context) {
+	userInfo, err := user.GetUserInfoByGinCtx(c)
+	if err != nil {
+		response.Unauthorized(c, "获取用户信息失败")
+		return
+	}
+
+	gormDB, err := db.GetGormDB()
+	if err != nil {
+		response.ServerError(c, "服务器内部错误")
+		return
+	}
+
+	timers := []model.Timer{}
+	if err := gormDB.Where("uid = ?", userInfo.ID).Find(&timers).Error; err != nil {
+		response.ServerError(c, "获取统计数据失败")
+		return
+	}
+
+	var ruleCount, accountCount int64
+	gormDB.Model(&model.Rule{}).Where("uid = ?", userInfo.ID).Count(&ruleCount)
+	gormDB.Model(&model.Account{}).Where("uid = ?", userInfo.ID).Count(&accountCount)
+
+	recentLogs := []model.ExecutionLog{}
+	gormDB.Where("uid = ?", userInfo.ID).Order("id DESC").Limit(10).Find(&recentLogs)
+
+	now := time.Now().Unix()
+	var (
+		enabledCount   int
+		triggeredCount int
+		urgent         *model.Timer
+	)
+
+	for i := range timers {
+		timer := timers[i]
+		if !timer.Enabled {
+			continue
+		}
+		enabledCount++
+		if timer.Triggered {
+			triggeredCount++
+			continue
+		}
+		// 剩余时间最短的启用中 Timer
+		if urgent == nil || timer.NextSignTime() < urgent.NextSignTime() {
+			urgent = &timers[i]
+		}
+	}
+
+	overview := gin.H{
+		"timer_count":     len(timers),
+		"enabled_timers":  enabledCount,
+		"triggered_count": triggeredCount,
+		"rule_count":      ruleCount,
+		"account_count":   accountCount,
+		"server_time":     now,
+		"recent_logs":     recentLogs,
+	}
+
+	if urgent != nil {
+		overview["urgent_timer"] = urgent
+		overview["urgent_seconds_left"] = urgent.NextSignTime() - now
+	}
+
+	response.OK(c, overview)
+}