copy: call every plan 计划 instead of 套餐 (#2763)

The Chinese copy used 套餐 (package) for the subscription plan in the cloud
banner, the model errors and the multi-tenant docs. Name the same concept 计划
everywhere; Traditional Chinese keeps 計劃.

web/src/i18n/locales/zh-Hans.ts

@@ -3550,7 +3550,7 @@ const zhHans = {
   cloud_banner: {
     message: '当前为 LangBot Cloud 云服务环境。如需独享资源与更高配额，可选择',
     dedicated_link: '独立环境版 LangBot Cloud',
-    cta_dedicated: '查看独立环境套餐',
+    cta_dedicated: '查看独立环境计划',
     or: '或',
     self_hosted_link: '自部署开源版本',
     period: '。',

web/src/i18n/locales/zh-Hant.ts

@@ -3551,7 +3551,7 @@ const zhHant = {
     message:
       '目前為 LangBot Cloud 雲端服務環境。如需專屬資源與更高配額，可選擇',
     dedicated_link: '獨立環境版 LangBot Cloud',
-    cta_dedicated: '查看獨立環境套餐',
+    cta_dedicated: '查看獨立環境計劃',
     or: '或',
     self_hosted_link: '自行部署的開源版本',
     period: '。',