feat: update request ID handling to use trace package constants

backend/internal/api/middleware/request_id.go

@@ -3,25 +3,25 @@ package middleware
 import (
     "context"
     "github.com/Wikid82/charon/backend/internal/logger"
+    "github.com/Wikid82/charon/backend/internal/trace"
     "github.com/gin-gonic/gin"
     "github.com/google/uuid"
     "github.com/sirupsen/logrus"
 )
 
-const RequestIDKey = "requestID"
 const RequestIDHeader = "X-Request-ID"
 
 // RequestID generates a uuid per request and places it in context and header.
 func RequestID() gin.HandlerFunc {
     return func(c *gin.Context) {
         rid := uuid.New().String()
-        c.Set(RequestIDKey, rid)
+        c.Set(string(trace.RequestIDKey), rid)
         c.Writer.Header().Set(RequestIDHeader, rid)
         // Add to logger fields for this request
         entry := logger.WithFields(map[string]interface{}{"request_id": rid})
         c.Set("logger", entry)
         // Propagate into the request context so it can be used by services
-        ctx := context.WithValue(c.Request.Context(), RequestIDKey, rid)
+        ctx := context.WithValue(c.Request.Context(), trace.RequestIDKey, rid)
         c.Request = c.Request.WithContext(ctx)
         c.Next()
     }