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/handler/provider.go

@@ -0,0 +1,51 @@
+package handler
+
+import (
+	"git.sundynix.cn/Blizzard/Veyra/internal/apperror"
+	"git.sundynix.cn/Blizzard/Veyra/internal/service"
+	"github.com/gin-gonic/gin"
+	"net/http"
+)
+
+func bindProviders(r *gin.Engine, options IdentityOptions) {
+	admin := r.Group("/api/admin/v1", func(c *gin.Context) { authenticate(c, options, "admin") })
+	admin.Use(func(c *gin.Context) {
+		if options.Providers == nil {
+			fail(c, apperror.ErrUnavailable)
+			return
+		}
+		c.Next()
+	})
+	admin.GET("/providers", func(c *gin.Context) {
+		list, err := options.Providers.List(c.Request.Context(), currentUser(c))
+		if err != nil {
+			fail(c, err)
+			return
+		}
+		success(c, http.StatusOK, list)
+	})
+	admin.PUT("/providers/:key", func(c *gin.Context) {
+		if !sameOrigin(c.Request) {
+			fail(c, apperror.ErrForbidden)
+			return
+		}
+		var input service.ProviderInput
+		if !decode(c, &input) {
+			return
+		}
+		config, err := options.Providers.Save(c.Request.Context(), currentUser(c), c.Param("key"), c.Writer.Header().Get("X-Request-ID"), input)
+		if err != nil {
+			fail(c, err)
+			return
+		}
+		success(c, http.StatusOK, config)
+	})
+	admin.GET("/audit-events", func(c *gin.Context) {
+		list, err := options.Providers.Audit(c.Request.Context(), currentUser(c))
+		if err != nil {
+			fail(c, err)
+			return
+		}
+		success(c, http.StatusOK, list)
+	})
+}