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/notifications/LowEnergyWarning.vue

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+<template>
+  <div v-if="showWarning" class="bg-destructive/10 border-b border-destructive/20">
+    <div class="px-4 sm:px-6 py-2 flex items-center justify-between gap-3">
+      <!-- 警告图标和信息 -->
+      <div class="flex items-center gap-2 flex-1 min-w-0">
+        <Zap class="h-5 w-5 text-destructive shrink-0 animate-pulse" />
+        <div class="flex-1 min-w-0">
+          <p class="text-sm font-semibold text-destructive">
+            {{ t('energy.lowWarning') }}
+          </p>
+          <p class="text-xs text-muted-foreground">
+            {{ detailMessage }}
+          </p>
+        </div>
+      </div>
+
+      <!-- 建造电站按钮 -->
+      <Button @click="goToBuildSolarPlant" variant="outline" size="sm" class="shrink-0">
+        {{ t('energy.buildSolarPlant') }}
+      </Button>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+  import { computed } from 'vue'
+  import { useRouter } from 'vue-router'
+  import { useGameStore } from '@/stores/gameStore'
+  import { Button } from '@/components/ui/button'
+  import { Zap } from 'lucide-vue-next'
+  import { useI18n } from '@/composables/useI18n'
+  import * as resourceLogic from '@/logic/resourceLogic'
+  import * as officerLogic from '@/logic/officerLogic'
+
+  const gameStore = useGameStore()
+  const router = useRouter()
+  const { t } = useI18n()
+
+  // 获取当前星球
+  const planet = computed(() => gameStore.currentPlanet)
+
+  // 计算能量产量
+  const energyProduction = computed(() => {
+    if (!planet.value) return 0
+    const now = Date.now()
+    const bonuses = officerLogic.calculateActiveBonuses(gameStore.player.officers, now)
+    return resourceLogic.calculateEnergyProduction(planet.value, { energyProductionBonus: bonuses.energyProductionBonus })
+  })
+
+  // 计算能量消耗
+  const energyConsumption = computed(() => {
+    if (!planet.value) return 0
+    return resourceLogic.calculateEnergyConsumption(planet.value)
+  })
+
+  // 是否显示警告（电力产量 < 消耗）
+  const showWarning = computed(() => {
+    if (!planet.value) return false
+    return energyProduction.value < energyConsumption.value
+  })
+
+  // 详细消息
+  const detailMessage = computed(() => {
+    const deficit = Math.ceil(energyConsumption.value - energyProduction.value)
+    return t('energy.deficitDetail', { deficit: deficit.toString() })
+  })
+
+  // 跳转到建筑页面建造太阳能电站
+  const goToBuildSolarPlant = () => {
+    router.push('/buildings')
+  }
+</script>