feat: 自定义版本功能更新

- 新增家庭共享订阅管理
- 新增用户邀请统计
- 新增签名和订阅模式设置表单
- 更新 API 服务层和国际化文件
- UI 组件优化（enhanced-input、pro-table）

apps/admin/src/sections/system/user-security/invite-form.tsx

@@ -36,6 +36,7 @@ const inviteSchema = z.object({
   forced_invite: z.boolean().optional(),
   referral_percentage: z.number().optional(),
   only_first_purchase: z.boolean().optional(),
+  gift_days: z.number().optional(),
 });
 
 type InviteFormData = z.infer<typeof inviteSchema>;
@@ -60,6 +61,7 @@ export default function InviteConfig() {
       forced_invite: false,
       referral_percentage: 0,
       only_first_purchase: false,
+      gift_days: 0,
     },
   });
 
@@ -185,6 +187,38 @@ export default function InviteConfig() {
                 )}
               />
 
+              <FormField
+                control={form.control}
+                name="gift_days"
+                render={({ field }) => (
+                  <FormItem>
+                    <FormLabel>
+                      {t("invite.giftDays", "Invite Gift Days")}
+                    </FormLabel>
+                    <FormControl>
+                      <EnhancedInput
+                        min={0}
+                        onValueBlur={(value) => field.onChange(Number(value))}
+                        placeholder={t(
+                          "invite.giftDaysPlaceholder",
+                          "Enter days"
+                        )}
+                        suffix={t("invite.giftDaysSuffix", "day(s)")}
+                        type="number"
+                        value={field.value}
+                      />
+                    </FormControl>
+                    <FormDescription>
+                      {t(
+                        "invite.giftDaysDescription",
+                        "When referral percentage is 0, both the inviter and invitee receive extra subscription days after a purchase"
+                      )}
+                    </FormDescription>
+                    <FormMessage />
+                  </FormItem>
+                )}
+              />
+
               <FormField
                 control={form.control}
                 name="only_first_purchase"