feat: sync current progress (P0 hardening + P1 observability + deploy docs/systemd)

internal/api/requestid.go

@@ -0,0 +1,25 @@
+package api
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+
+	"github.com/gin-gonic/gin"
+)
+
+func RequestID() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		id := c.GetHeader("X-Request-Id")
+		if id == "" {
+			b := make([]byte, 8)
+			if _, err := rand.Read(b); err == nil {
+				id = hex.EncodeToString(b)
+			} else {
+				id = "req-unknown"
+			}
+		}
+		c.Set("request_id", id)
+		c.Header("X-Request-Id", id)
+		c.Next()
+	}
+}