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/identity_test.go

@@ -2,8 +2,7 @@ package handler
 
 import (
 	"context"
-	"io"
-	"log/slog"
+	"go.uber.org/zap"
 	"net/http"
 	"net/http/httptest"
 	"strings"
@@ -18,7 +17,7 @@ func TestAuthenticationAndCSRFBoundaries(t *testing.T) {
 		t.Fatal(err)
 	}
 	probe := func(context.Context) error { return nil }
-	router := NewRouter(service.NewHealthService(probe, probe), slog.New(slog.NewTextHandler(io.Discard, nil)), IdentityOptions{Auth: auth, DevelopmentLogin: true})
+	router := NewRouter(service.NewHealthService(probe, probe), zap.NewNop(), IdentityOptions{Auth: auth, DevelopmentLogin: true})
 	for _, tc := range []struct {
 		method, path, body, origin string
 		status                     int
@@ -43,7 +42,7 @@ func TestAuthenticationAndCSRFBoundaries(t *testing.T) {
 
 func TestDevelopmentLoginDisabledByDefault(t *testing.T) {
 	probe := func(context.Context) error { return nil }
-	router := NewRouter(service.NewHealthService(probe, probe), slog.New(slog.NewTextHandler(io.Discard, nil)), IdentityOptions{})
+	router := NewRouter(service.NewHealthService(probe, probe), zap.NewNop(), IdentityOptions{})
 	rec := httptest.NewRecorder()
 	router.ServeHTTP(rec, httptest.NewRequest(http.MethodPost, "/api/v1/auth/login", strings.NewReader(`{}`)))
 	if rec.Code != http.StatusServiceUnavailable {