feat: add plugin upload functionality and optimize plugin logic

public/assets/admin/locales/en-US.js

@@ -188,7 +188,25 @@ window.XBOARD_TRANSLATIONS['en-US'] = {
       "install": "Install",
       "config": "Configure",
       "enable": "Enable",
-      "disable": "Disable"
+      "disable": "Disable",
+      "uninstall": "Uninstall"
+    },
+    "upload": {
+      "button": "Upload Plugin",
+      "title": "Upload Plugin",
+      "description": "Upload a plugin package (.zip)",
+      "dragText": "Drag and drop plugin package here, or",
+      "clickText": "browse",
+      "supportText": "Supports .zip files only",
+      "uploading": "Uploading...",
+      "error": {
+        "format": "Only .zip files are supported"
+      }
+    },
+    "delete": {
+      "title": "Delete Plugin",
+      "description": "Are you sure you want to delete this plugin? This action cannot be undone.",
+      "button": "Delete"
     },
     "uninstall": {
       "title": "Uninstall Plugin",
@@ -213,7 +231,11 @@ window.XBOARD_TRANSLATIONS['en-US'] = {
       "disableError": "Failed to disable plugin",
       "configLoadError": "Failed to load plugin configuration",
       "configSaveSuccess": "Configuration saved successfully",
-      "configSaveError": "Failed to save configuration"
+      "configSaveError": "Failed to save configuration",
+      "uploadSuccess": "Plugin uploaded successfully",
+      "uploadError": "Failed to upload plugin",
+      "deleteSuccess": "Plugin deleted successfully",
+      "deleteError": "Failed to delete plugin"
     }
   },
   "settings": {

public/assets/admin/locales/ko-KR.js

@@ -188,7 +188,25 @@ window.XBOARD_TRANSLATIONS['ko-KR'] = {
       "install": "설치",
       "config": "설정",
       "enable": "활성화",
-      "disable": "비활성화"
+      "disable": "비활성화",
+      "uninstall": "제거"
+    },
+    "upload": {
+      "button": "플러그인 업로드",
+      "title": "플러그인 업로드",
+      "description": "플러그인 패키지 업로드 (.zip)",
+      "dragText": "플러그인 패키지를 여기에 끌어다 놓거나",
+      "clickText": "찾아보기",
+      "supportText": ".zip 파일만 지원됩니다",
+      "uploading": "업로드 중...",
+      "error": {
+        "format": ".zip 파일만 지원됩니다"
+      }
+    },
+    "delete": {
+      "title": "플러그인 삭제",
+      "description": "이 플러그인을 삭제하시겠습니까? 삭제 후 플러그인 데이터가 삭제됩니다.",
+      "button": "삭제"
     },
     "uninstall": {
       "title": "플러그인 제거",
@@ -213,7 +231,9 @@ window.XBOARD_TRANSLATIONS['ko-KR'] = {
       "disableError": "플러그인 비활성화에 실패했습니다",
       "configLoadError": "플러그인 설정을 불러오는데 실패했습니다",
       "configSaveSuccess": "설정이 성공적으로 저장되었습니다",
-      "configSaveError": "설정 저장에 실패했습니다"
+      "configSaveError": "설정 저장에 실패했습니다",
+      "uploadSuccess": "플러그인이 성공적으로 업로드되었습니다",
+      "uploadError": "플러그인 업로드에 실패했습니다"
     }
   },
   "settings": {

public/assets/admin/locales/zh-CN.js

@@ -176,9 +176,9 @@ window.XBOARD_TRANSLATIONS['zh-CN'] = {
       "other": "其他"
     },
     "tabs": {
-      "all": "全部插件",
+      "all": "所有插件",
       "installed": "已安装",
-      "available": "可用插件"
+      "available": "可用"
     },
     "status": {
       "enabled": "已启用",
@@ -188,11 +188,29 @@ window.XBOARD_TRANSLATIONS['zh-CN'] = {
       "install": "安装",
       "config": "配置",
       "enable": "启用",
-      "disable": "禁用"
+      "disable": "禁用",
+      "uninstall": "卸载"
+    },
+    "upload": {
+      "button": "上传插件",
+      "title": "上传插件",
+      "description": "上传插件包 (.zip)",
+      "dragText": "拖拽插件包到此处，或",
+      "clickText": "浏览",
+      "supportText": "仅支持 .zip 格式文件",
+      "uploading": "上传中...",
+      "error": {
+        "format": "仅支持 .zip 格式文件"
+      }
+    },
+    "delete": {
+      "title": "删除插件",
+      "description": "确定要删除此插件吗？此操作无法撤销。",
+      "button": "删除"
     },
     "uninstall": {
       "title": "卸载插件",
-      "description": "确定要卸载该插件吗？卸载后插件数据将被清除。",
+      "description": "确定要卸载此插件吗？卸载后插件数据将被清除。",
       "button": "卸载"
     },
     "config": {
@@ -213,7 +231,11 @@ window.XBOARD_TRANSLATIONS['zh-CN'] = {
       "disableError": "插件禁用失败",
       "configLoadError": "加载插件配置失败",
       "configSaveSuccess": "配置保存成功",
-      "configSaveError": "配置保存失败"
+      "configSaveError": "配置保存失败",
+      "uploadSuccess": "插件上传成功",
+      "uploadError": "插件上传失败",
+      "deleteSuccess": "插件删除成功",
+      "deleteError": "插件删除失败"
     }
   },
   "settings": {