fix: 限速输入统一为 Mbps，去掉 mbToBits 转换

- 订阅表单 speed_limit 去掉 bitsToMb/mbToBits 转换，直接存 Mbps
- traffic_limit speed_limit 标签从 KB 改为 Mbps
- 节点组 speed_limit 标签从 KB/s 改为 Mbps
- Display trafficSpeed 类型直接显示 {value} Mbps

Co-Authored-By: claude-flow <ruv@ruv.net>

apps/admin/src/components/display.tsx

@@ -38,7 +38,7 @@ export function Display<T extends number | undefined | null>({
   }
 
   if (type === "trafficSpeed") {
-    return value ? `${formatBytes(value).replace("B", "b")}ps` : "0";
+    return value ? `${value} Mbps` : "0";
   }
 
   if (type === "number") {

apps/admin/src/sections/group/node-group-form.tsx

@@ -412,7 +412,7 @@ const NodeGroupForm = ({
 
               <div className="space-y-2">
                 <Label htmlFor="speed_limit">
-                  {t("speedLimit", "Speed Limit (KB/s)")}
+                  {t("speedLimit", "Speed Limit (Mbps)")}
                 </Label>
                 <Input
                   id="speed_limit"

apps/admin/src/sections/product/subscribe-form.tsx

@@ -493,12 +493,6 @@ export default function SubscribeForm<T extends Record<string, any>>({
                                 placeholder={t("form.noLimit")}
                                 type="number"
                                 {...field}
-                                formatInput={(value) =>
-                                  unitConversion("bitsToMb", value)
-                                }
-                                formatOutput={(value) =>
-                                  unitConversion("mbToBits", value)
-                                }
                                 onValueChange={(value) => {
                                   form.setValue(field.name, value);
                                 }}
@@ -1621,8 +1615,8 @@ export default function SubscribeForm<T extends Record<string, any>>({
                                   name: "speed_limit",
                                   type: "number",
                                   placeholder: t(
-                                    "form.speedLimitKb",
-                                    "Speed Limit (kb)"
+                                    "form.speedLimitMbps",
+                                    "Speed Limit (Mbps)"
                                   ),
                                   min: 0,
                                   onKeyDown: (
@@ -1640,7 +1634,17 @@ export default function SubscribeForm<T extends Record<string, any>>({
                                   },
                                 },
                               ]}
-                              onChange={field.onChange}
+                              onChange={(items: any[]) => {
+                                field.onChange(
+                                  items.map((item) => ({
+                                    ...item,
+                                    stat_value: Number(item.stat_value) || 0,
+                                    traffic_usage:
+                                      Number(item.traffic_usage) || 0,
+                                    speed_limit: Number(item.speed_limit) || 0,
+                                  }))
+                                );
+                              }}
                               value={
                                 field.value && field.value.length > 0
                                   ? field.value