docs: 新增西班牙语和日语README并优化多语言文档

新增README-ES.md（西班牙语）和README-JA.md（日语）文档，完善多语言README互链。优化各语言README徽章、技术栈、外链格式及语言切换区，提升文档一致性与可读性。

src/components/ui/collapsible/Collapsible.vue

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+<template>
+  <CollapsibleRoot v-slot="slotProps" data-slot="collapsible" v-bind="forwarded">
+    <slot v-bind="slotProps" />
+  </CollapsibleRoot>
+</template>
+
+<script setup lang="ts">
+  import type { CollapsibleRootEmits, CollapsibleRootProps } from 'reka-ui'
+  import { CollapsibleRoot, useForwardPropsEmits } from 'reka-ui'
+
+  const props = defineProps<CollapsibleRootProps>()
+  const emits = defineEmits<CollapsibleRootEmits>()
+
+  const forwarded = useForwardPropsEmits(props, emits)
+</script>

src/components/ui/collapsible/CollapsibleContent.vue

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+<template>
+  <CollapsibleContent data-slot="collapsible-content" v-bind="props">
+    <slot />
+  </CollapsibleContent>
+</template>
+
+<script setup lang="ts">
+  import type { CollapsibleContentProps } from 'reka-ui'
+  import { CollapsibleContent } from 'reka-ui'
+
+  const props = defineProps<CollapsibleContentProps>()
+</script>

src/components/ui/collapsible/CollapsibleTrigger.vue

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+<template>
+  <CollapsibleTrigger data-slot="collapsible-trigger" v-bind="props">
+    <slot />
+  </CollapsibleTrigger>
+</template>
+
+<script setup lang="ts">
+  import type { CollapsibleTriggerProps } from 'reka-ui'
+  import { CollapsibleTrigger } from 'reka-ui'
+
+  const props = defineProps<CollapsibleTriggerProps>()
+</script>

src/components/ui/collapsible/index.ts

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+export { default as Collapsible } from './Collapsible.vue'
+export { default as CollapsibleContent } from './CollapsibleContent.vue'
+export { default as CollapsibleTrigger } from './CollapsibleTrigger.vue'