feat : init Central project — Symfony 8 + Nuxt 4 + Docker starter

Same architecture as Lesstime: API Platform 4, JWT auth, @malio/layer-ui,
PostgreSQL 16, Docker Compose (ports 8083/3003/5436), dark mode theme.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/components/ui/SidebarLink.vue

@@ -0,0 +1,52 @@
+<template>
+    <NuxtLink
+        :to="to"
+        class="group/link relative flex items-center transition-colors hover:text-primary-500"
+        :class="linkClasses"
+        :active-class="exact ? '' : activeClass"
+        :exact-active-class="exact ? activeClass : ''"
+    >
+        <Icon :name="icon" :size="sub ? '20' : '24'" class="flex-shrink-0" />
+        <span
+            v-if="!collapsed"
+            class="self-baseline whitespace-nowrap overflow-hidden transition-opacity duration-300"
+            :class="sub ? 'text-sm' : 'text-md'"
+        >
+            {{ label }}
+        </span>
+        <div
+            v-if="collapsed"
+            class="pointer-events-none absolute left-full z-50 ml-2 rounded-md bg-neutral-800 px-2 py-1 text-xs text-white opacity-0 shadow-lg transition-opacity group-hover/link:pointer-events-auto group-hover/link:opacity-100 whitespace-nowrap"
+        >
+            {{ label }}
+        </div>
+    </NuxtLink>
+</template>
+
+<script setup lang="ts">
+const props = defineProps<{
+    to: string
+    icon: string
+    label: string
+    collapsed: boolean
+    sub?: boolean
+    exact?: boolean
+}>()
+
+const activeClass = computed(() => {
+    if (props.collapsed) {
+        return '!text-primary-500 bg-primary-500/10'
+    }
+    return '!text-primary-500 bg-tertiary-500'
+})
+
+const linkClasses = computed(() => {
+    if (props.collapsed) {
+        return 'justify-center w-10 h-10 mx-auto my-1 p-2 rounded-lg text-neutral-600 hover:text-primary-500 hover:bg-primary-500/10'
+    }
+    if (props.sub) {
+        return 'gap-3 px-4 py-2 pl-12 text-sm font-semibold text-neutral-700'
+    }
+    return 'gap-3 px-4 py-3 text-md font-semibold text-neutral-700'
+})
+</script>