重构日志与可观测性体系

新增单行文本编码器与结构化 GORM 日志，统一错误记录与请求日志策略，收紧日志文件权限并修复按天切分与压缩，支付回调参数脱敏，生产强制阿里云短信，RequestID 校验防注入，日志文案中文化。

backend/internal/middleware/recovery.go

@@ -11,22 +11,15 @@ import (
 	"go.uber.org/zap"
 )
 
-func Recovery(logger *zap.Logger) gin.HandlerFunc {
+const contextPanicStack = "panic_stack"
+
+func Recovery(_ *zap.Logger) gin.HandlerFunc {
 	return func(c *gin.Context) {
 		defer func() {
 			if recovered := recover(); recovered != nil {
 				err := fmt.Errorf("panic: %v", recovered)
 				_ = c.Error(err)
-				logger.Error("http panic recovered",
-					zap.String("request_id", GetRequestID(c)),
-					zap.String("method", c.Request.Method),
-					zap.String("path", c.Request.URL.Path),
-					zap.String("route", c.FullPath()),
-					zap.String("client_ip", c.ClientIP()),
-					zap.String("user_agent", c.GetHeader("User-Agent")),
-					zap.String("panic", fmt.Sprint(recovered)),
-					zap.ByteString("stack", debug.Stack()),
-				)
+				c.Set(contextPanicStack, string(debug.Stack()))
 				if !c.Writer.Written() {
 					response.Error(c, http.StatusInternalServerError, "internal_error", "服务暂时不可用")
 				}