feat: 完成模拟交易闭环、App 与 A 股行情接入

统一单入口 Go 工程与前端依赖目录，增加后台供应商配置、候选审核、计划预算、成交冲正、持仓复盘和站内通知。接入策略版本、Python 回测、可配置 A 股公开行情及 zap 文件轮转日志，补充迁移、契约与验证。

internal/model/notification.go

@@ -0,0 +1,46 @@
+package model
+
+import "time"
+
+type Notification struct {
+	ID        string     `db:"id" json:"id"`
+	UserID    string     `db:"user_id" json:"-"`
+	EventID   string     `db:"event_id" json:"event_id"`
+	PlanID    *string    `db:"plan_id" json:"plan_id"`
+	Title     string     `db:"title" json:"title"`
+	Body      string     `db:"body" json:"body"`
+	ReadAt    *time.Time `db:"read_at" json:"read_at"`
+	CreatedAt time.Time  `db:"created_at" json:"created_at"`
+}
+
+func (Notification) TableName() string { return "veyra_notification" }
+
+type QuoteSnapshot struct {
+	ID         string    `db:"id" json:"id"`
+	Symbol     string    `db:"symbol" json:"symbol"`
+	Exchange   string    `db:"exchange" json:"exchange"`
+	DataMode   string    `db:"data_mode" json:"data_mode"`
+	PriceMinor int64     `db:"price_minor" json:"-"`
+	Price      string    `json:"price"`
+	ObservedAt time.Time `db:"observed_at" json:"observed_at"`
+	Version    int64     `db:"version" json:"version"`
+	CreatedAt  time.Time `db:"created_at" json:"created_at"`
+	UpdatedAt  time.Time `db:"updated_at" json:"updated_at"`
+}
+
+func (QuoteSnapshot) TableName() string { return "veyra_quote_snapshot" }
+
+type PlanTrigger struct {
+	ID              string    `db:"id"`
+	PlanID          string    `db:"plan_id"`
+	QuoteSnapshotID string    `db:"quote_snapshot_id"`
+	QuoteVersion    int64     `db:"quote_version"`
+	TriggeredAt     time.Time `db:"triggered_at"`
+}
+
+func (PlanTrigger) TableName() string { return "veyra_plan_trigger" }
+
+type NotificationTask struct {
+	OutboxEvent
+	RecipientCount int `json:"recipient_count"`
+}