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.

web/default/src/features/usage-logs/components/common-logs-filter-bar.tsx

@@ -88,6 +88,8 @@ export function CommonLogsFilterBar<TData>(
     if (searchParams.group) next.group = searchParams.group
     if (searchParams.username) next.username = searchParams.username
     if (searchParams.requestId) next.requestId = searchParams.requestId
+    if (searchParams.upstreamRequestId)
+      next.upstreamRequestId = searchParams.upstreamRequestId
 
     if (Object.keys(next).length > 0) {
       setFilters((prev) => ({ ...prev, ...next }))
@@ -106,6 +108,7 @@ export function CommonLogsFilterBar<TData>(
     searchParams.group,
     searchParams.username,
     searchParams.requestId,
+    searchParams.upstreamRequestId,
     searchParams.type,
   ])
 
@@ -161,7 +164,8 @@ export function CommonLogsFilterBar<TData>(
     !!filters.token ||
     !!filters.username ||
     !!filters.channel ||
-    !!filters.requestId
+    !!filters.requestId ||
+    !!filters.upstreamRequestId
 
   const hasAdditionalFilters =
     !!filters.model || !!filters.group || !!logType || hasExpandedFilters
@@ -290,6 +294,15 @@ export function CommonLogsFilterBar<TData>(
             onKeyDown={handleKeyDown}
             className={inputClass}
           />
+          <Input
+            placeholder={t('Upstream Request ID')}
+            value={filters.upstreamRequestId || ''}
+            onChange={(e) =>
+              handleChange('upstreamRequestId', e.target.value)
+            }
+            onKeyDown={handleKeyDown}
+            className={inputClass}
+          />
         </>
       }
       hasExpandedActiveFilters={hasExpandedFilters}

web/default/src/features/usage-logs/components/dialogs/details-dialog.tsx

@@ -519,6 +519,13 @@ export function DetailsDialog(props: DetailsDialogProps) {
                   mono
                 />
               )}
+              {props.log.upstream_request_id && (
+                <DetailRow
+                  label={t('Upstream Request ID')}
+                  value={props.log.upstream_request_id}
+                  mono
+                />
+              )}
 
               {props.isAdmin && props.log.channel > 0 && (
                 <DetailRow