feat: 更新导航菜单 - 移除企业一体机，新增学习中心，调整菜单顺序 (#160)

* fix: prevent language switcher dropdown from overflowing on mobile

* feat: 更新导航菜单，去掉企业一体机，增加学习中心

* feat: 调整导航菜单顺序为：定价、文档、学习中心

* feat: 添加日语菜单学习中心入口

* fix: resolve remaining conflict markers in LangSwitcher.tsx

* revert: 撤销 LangSwitcher.tsx 变更，使用 upstream 主版本

---------

Co-authored-by: archer <archer@archerdeMac-mini.local>

Author: archer-claw

src/locales/en.json

@@ -6,13 +6,17 @@
     "videoDark": "/images/video/en/video_dark.png"
   },
   "links": [
+    {
+      "label": "Pricing",
+      "href": "/price"
+    },
     {
       "label": "Docs",
       "href": "https://doc.fastgpt.io/"
     },
     {
-      "label": "Pricing",
-      "href": "/price"
+      "label": "Learning Center",
+      "href": "https://video.fastgpt.cn/videos"
     }
   ],
   "Hero": {

src/locales/ja.json

@@ -13,6 +13,10 @@
     {
       "label": "ドキュメント",
       "href": "https://doc.fastgpt.io/"
+    },
+    {
+      "label": "学習センター",
+      "href": "https://video.fastgpt.cn/videos"
     }
   ],
   "Hero": {

src/locales/zh.json

@@ -6,17 +6,17 @@
     "videoDark": "/images/video/zh/video_dark.png"
   },
   "links": [
-    {
-      "label": "文档",
-      "href": "https://doc.fastgpt.io/docs/introduction"
-    },
     {
       "label": "定价",
       "href": "/price"
     },
     {
-      "label": "企业一体机",
-      "href": "/enterprise"
+      "label": "文档",
+      "href": "https://doc.fastgpt.io/docs/introduction"
+    },
+    {
+      "label": "学习中心",
+      "href": "https://video.fastgpt.cn/videos"
     }
   ],
   "Hero": {