feat : modal d'export inventaire avec filtres par tranches d'âge

- UiModal : composant générique réutilisable (teleport, escape, backdrop, max-width configurable)
- InventoryExportModal : 3 checkboxes pour les tranches d'âge, footer centré sans annuler
- BovineRepository::findActiveForInventoryExport(?array $ageRanges) en DQL
- Endpoint inventory-export accepte ageRanges (comma-separated) en query param
- Aucune coche = export complet (comportement actuel intact)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/components/ui/UiModal.vue

@@ -0,0 +1,96 @@
+<template>
+    <Teleport to="body">
+        <Transition
+            enter-active-class="transition duration-150 ease-out"
+            enter-from-class="opacity-0"
+            enter-to-class="opacity-100"
+            leave-active-class="transition duration-100 ease-in"
+            leave-from-class="opacity-100"
+            leave-to-class="opacity-0"
+        >
+            <div
+                v-if="modelValue"
+                class="fixed inset-0 z-40 flex items-center justify-center bg-black/50 px-4"
+                role="dialog"
+                aria-modal="true"
+                @mousedown.self="closeOnBackdrop"
+            >
+                <div
+                    class="w-full rounded-md bg-white shadow-2xl"
+                    :class="maxWidth"
+                    @mousedown.stop
+                >
+                    <div class="flex items-center justify-between border-b border-slate-200 px-6 py-4">
+                        <h2 class="text-xl font-bold uppercase text-primary-500">{{ title }}</h2>
+                        <button
+                            type="button"
+                            class="text-slate-500 hover:text-primary-500 flex items-center"
+                            aria-label="Fermer"
+                            @click="close"
+                        >
+                            <Icon name="mdi:close" size="24" />
+                        </button>
+                    </div>
+
+                    <div class="px-6 py-5">
+                        <slot />
+                    </div>
+
+                    <div
+                        v-if="$slots.footer"
+                        class="border-t border-slate-200 px-6 py-4"
+                    >
+                        <slot name="footer" :close="close" />
+                    </div>
+                </div>
+            </div>
+        </Transition>
+    </Teleport>
+</template>
+
+<script setup lang="ts">
+import { onMounted, onBeforeUnmount, watch } from 'vue'
+
+const props = withDefaults(defineProps<{
+    modelValue: boolean
+    title?: string
+    closeOnBackdropClick?: boolean
+    maxWidth?: string
+}>(), {
+    title: '',
+    closeOnBackdropClick: true,
+    maxWidth: 'max-w-lg'
+})
+
+const emit = defineEmits<{
+    (e: 'update:modelValue', value: boolean): void
+}>()
+
+const close = () => emit('update:modelValue', false)
+
+const closeOnBackdrop = () => {
+    if (props.closeOnBackdropClick) close()
+}
+
+const onKeydown = (event: KeyboardEvent) => {
+    if (event.key === 'Escape' && props.modelValue) close()
+}
+
+watch(() => props.modelValue, (open) => {
+    if (typeof document === 'undefined') return
+    document.body.style.overflow = open ? 'hidden' : ''
+})
+
+onMounted(() => {
+    if (typeof document !== 'undefined') {
+        document.addEventListener('keydown', onKeydown)
+    }
+})
+
+onBeforeUnmount(() => {
+    if (typeof document !== 'undefined') {
+        document.removeEventListener('keydown', onKeydown)
+        document.body.style.overflow = ''
+    }
+})
+</script>