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/logging/logging.go

@@ -0,0 +1,51 @@
+// Package logging supplies readable console output and rotating structured files.
+package logging
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+	"gopkg.in/natefinch/lumberjack.v2"
+)
+
+type Options struct {
+	Directory, Level                  string
+	MaxSizeMB, MaxBackups, MaxAgeDays int
+}
+
+func New(o Options) (*zap.Logger, func(), error) {
+	level, err := zapcore.ParseLevel(o.Level)
+	if err != nil {
+		return nil, nil, fmt.Errorf("invalid LOG_LEVEL")
+	}
+	if o.Directory == "" || o.MaxSizeMB < 1 || o.MaxBackups < 1 || o.MaxAgeDays < 1 {
+		return nil, nil, fmt.Errorf("invalid logging configuration")
+	}
+	if err := os.MkdirAll(o.Directory, 0750); err != nil {
+		return nil, nil, fmt.Errorf("create log directory: %w", err)
+	}
+	path := filepath.Join(o.Directory, "veyra.log")
+	f, err := os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
+	if err != nil {
+		return nil, nil, fmt.Errorf("open log file: %w", err)
+	}
+	if err := f.Close(); err != nil {
+		return nil, nil, fmt.Errorf("close initial log file: %w", err)
+	}
+	file := &lumberjack.Logger{Filename: path, MaxSize: o.MaxSizeMB, MaxBackups: o.MaxBackups, MaxAge: o.MaxAgeDays, Compress: true, LocalTime: true}
+	encoder := zap.NewProductionEncoderConfig()
+	encoder.TimeKey = "time"
+	encoder.MessageKey = "message"
+	encoder.EncodeTime = zapcore.ISO8601TimeEncoder
+	console := encoder
+	console.EncodeLevel = zapcore.CapitalLevelEncoder
+	core := zapcore.NewTee(
+		zapcore.NewCore(zapcore.NewConsoleEncoder(console), zapcore.Lock(zapcore.AddSync(os.Stdout)), level),
+		zapcore.NewCore(zapcore.NewJSONEncoder(encoder), zapcore.AddSync(file), level),
+	)
+	logger := zap.New(core, zap.AddCaller(), zap.AddStacktrace(zapcore.DPanicLevel))
+	return logger, func() { _ = logger.Sync(); _ = file.Close() }, nil
+}

internal/logging/logging_test.go

@@ -0,0 +1,88 @@
+package logging
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"go.uber.org/zap"
+)
+
+func TestFileOutputAndLevel(t *testing.T) {
+	dir := t.TempDir()
+	logger, closeLogs, err := New(Options{dir, "warn", 1, 2, 1})
+	if err != nil {
+		t.Fatal(err)
+	}
+	logger.Info("filtered")
+	logger.Warn("request rejected", zap.String("request_id", "test-request"), zap.Int("status", 409))
+	closeLogs()
+	data, err := os.ReadFile(filepath.Join(dir, "veyra.log"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	var row struct {
+		Level, Message, RequestID string
+		Status                    int
+	}
+	var fields map[string]json.RawMessage
+	if err := json.Unmarshal(data, &fields); err != nil {
+		t.Fatal(err)
+	}
+	_ = json.Unmarshal(fields["level"], &row.Level)
+	_ = json.Unmarshal(fields["message"], &row.Message)
+	_ = json.Unmarshal(fields["request_id"], &row.RequestID)
+	_ = json.Unmarshal(fields["status"], &row.Status)
+	if row.Level != "warn" || row.Message != "request rejected" || row.RequestID != "test-request" || row.Status != 409 || strings.Contains(string(data), "filtered") {
+		t.Fatalf("invalid structured log: %s", data)
+	}
+	info, err := os.Stat(filepath.Join(dir, "veyra.log"))
+	if err != nil || info.Mode().Perm() != 0600 {
+		t.Fatal("log file must be private")
+	}
+}
+
+func TestLogRotation(t *testing.T) {
+	dir := t.TempDir()
+	stdout := os.Stdout
+	discard, err := os.OpenFile(os.DevNull, os.O_WRONLY, 0)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer discard.Close()
+	os.Stdout = discard
+	logger, closeLogs, err := New(Options{dir, "info", 1, 2, 1})
+	os.Stdout = stdout
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer closeLogs()
+	for i := 0; i < 3; i++ {
+		logger.Info("rotation", zap.String("payload", strings.Repeat("x", 400000)))
+	}
+	entries, err := os.ReadDir(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	found := false
+	for _, entry := range entries {
+		if strings.HasPrefix(entry.Name(), "veyra-") {
+			found = true
+		}
+	}
+	if !found {
+		t.Fatal("exceeding size must rotate the log")
+	}
+}
+
+func TestCannotOpenLogs(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "file")
+	if err := os.WriteFile(path, nil, 0600); err != nil {
+		t.Fatal(err)
+	}
+	if _, _, err := New(Options{path, "info", 1, 1, 1}); err == nil {
+		t.Fatal("unwritable log directory must fail startup")
+	}
+}