feat: track upstream request ID and prevent response header override

When proxying through another new-api instance, the upstream
X-Oneapi-Request-Id was overwriting the local one in client responses.
This adds a new `upstream_request_id` field to the logs table, captures
the upstream ID during relay, and filters it from being copied back to
the client. Frontend gains search/filter and detail display support.

relay/channel/api_request.go

@@ -524,6 +524,10 @@ func doRequest(c *gin.Context, req *http.Request, info *common.RelayInfo) (*http
 		return nil, errors.New("resp is nil")
 	}
 
+	if upID := resp.Header.Get(common2.RequestIdKey); upID != "" {
+		c.Set(common2.UpstreamRequestIdKey, upID)
+	}
+
 	_ = req.Body.Close()
 	_ = c.Request.Body.Close()
 	return resp, nil

relay/channel/minimax/tts.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/QuantumNous/new-api/dto"
 	relaycommon "github.com/QuantumNous/new-api/relay/common"
+	"github.com/QuantumNous/new-api/service"
 	"github.com/QuantumNous/new-api/types"
 	"github.com/gin-gonic/gin"
 )
@@ -184,6 +185,9 @@ func handleChatCompletionResponse(c *gin.Context, resp *http.Response, info *rel
 
 	// Set response headers
 	for key, values := range resp.Header {
+		if !service.ShouldCopyUpstreamHeader(c, key, values) {
+			continue
+		}
 		for _, value := range values {
 			c.Header(key, value)
 		}

relay/channel/openai/audio.go

@@ -30,6 +30,9 @@ func OpenaiTTSHandler(c *gin.Context, resp *http.Response, info *relaycommon.Rel
 	usage.PromptTokens = info.GetEstimatePromptTokens()
 	usage.TotalTokens = info.GetEstimatePromptTokens()
 	for k, v := range resp.Header {
+		if !service.ShouldCopyUpstreamHeader(c, k, v) {
+			continue
+		}
 		c.Writer.Header().Set(k, v[0])
 	}
 	c.Writer.WriteHeader(resp.StatusCode)