feat: 新增多语言README并优化文档结构

新增德语、俄语、韩语、繁体中文多语言README，英文与简体中文README同步优化，统一下载链接与徽章样式，完善多语言入口。提升国际化支持与文档可读性。

src/components/dialogs/DetailDialog.vue

@@ -0,0 +1,64 @@
+<template>
+  <Dialog :open="dialogStore.isOpen" @update:open="handleClose">
+    <ScrollableDialogContent
+      v-if="dialogStore.type && dialogStore.itemType"
+      container-class="sm:max-w-[90vw] md:max-w-3xl lg:max-w-4xl max-h-[90vh]"
+    >
+      <template #header>
+        <DialogHeader>
+          <DialogTitle class="flex items-center gap-2">
+            {{ itemTitle }}
+            <Badge v-if="dialogStore.currentLevel !== undefined" variant="outline">
+              {{ t('common.currentLevel') }} {{ dialogStore.currentLevel }}
+            </Badge>
+          </DialogTitle>
+          <DialogDescription>
+            {{ itemDescription }}
+          </DialogDescription>
+        </DialogHeader>
+      </template>
+
+      <ItemDetailView :type="dialogStore.type" :itemType="dialogStore.itemType" :currentLevel="dialogStore.currentLevel" />
+    </ScrollableDialogContent>
+  </Dialog>
+</template>
+
+<script setup lang="ts">
+  import { computed } from 'vue'
+  import { Dialog, ScrollableDialogContent, DialogHeader, DialogTitle, DialogDescription } from '@/components/ui/dialog'
+  import { Badge } from '@/components/ui/badge'
+  import { useDetailDialogStore } from '@/stores/detailDialogStore'
+  import { useI18n } from '@/composables/useI18n'
+  import ItemDetailView from '@/components/common/ItemDetailView.vue'
+
+  const { t } = useI18n()
+  const dialogStore = useDetailDialogStore()
+
+  const itemTitle = computed(() => {
+    if (!dialogStore.type || !dialogStore.itemType) return ''
+    const typeMap = {
+      building: 'buildings',
+      technology: 'technologies',
+      ship: 'ships',
+      defense: 'defenses'
+    }
+    return t(`${typeMap[dialogStore.type]}.${dialogStore.itemType}`)
+  })
+
+  const itemDescription = computed(() => {
+    if (!dialogStore.type || !dialogStore.itemType) return ''
+    const typeMap = {
+      building: 'buildingDescriptions',
+      technology: 'technologyDescriptions',
+      ship: 'shipDescriptions',
+      defense: 'defenseDescriptions'
+    }
+    return t(`${typeMap[dialogStore.type]}.${dialogStore.itemType}`)
+  })
+
+  const handleClose = (open: boolean) => {
+    if (!open) {
+      dialogStore.close()
+    }
+  }
+</script>