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>

internal/accountConfigChecker/reg.go

@@ -1,20 +1,31 @@
 package accountConfigChecker
 
 import (
+	"sync"
+
 	"github.com/ssdomei232/goodBaby/drivers/bilibili"
 	"github.com/ssdomei232/goodBaby/drivers/email"
 	"github.com/ssdomei232/goodBaby/drivers/github"
 	"github.com/ssdomei232/goodBaby/drivers/onebot"
 )
 
+var (
+	once     sync.Once
+	registry *ValidatorRegistry
+)
+
+// InitValidatorRegistry 返回全局唯一的账号验证器注册表
 func InitValidatorRegistry() *ValidatorRegistry {
-	registry := NewValidatorRegistry()
+	once.Do(func() {
+		r := NewValidatorRegistry()
 
-	// 注册所有账号验证器
-	registry.Register(&bilibili.BilibiliAccountConfigValidator{})
-	registry.Register(&email.EmailAccountConfigValidator{})
-	registry.Register(&github.GitHubAccountConfigValidator{})
-	registry.Register(&onebot.OneBotAccountConfigValidator{})
+		// 注册所有账号验证器
+		r.Register(&bilibili.BilibiliAccountConfigValidator{})
+		r.Register(&email.EmailAccountConfigValidator{})
+		r.Register(&github.GitHubAccountConfigValidator{})
+		r.Register(&onebot.OneBotAccountConfigValidator{})
 
+		registry = r
+	})
 	return registry
 }