feat(frontend): layout header + drawer + router (9 routes)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/stores/tasks.js

@@ -0,0 +1,29 @@
+import { defineStore } from 'pinia';
+import { ref } from 'vue';
+import { tasksApi } from '@/api/tasks';
+export const useTasksStore = defineStore('tasks', () => {
+    const tasks = ref([]);
+    const loading = ref(false);
+    async function fetchAll(params) {
+        loading.value = true;
+        tasks.value = await tasksApi.list(params);
+        loading.value = false;
+    }
+    async function create(t) {
+        const created = await tasksApi.create(t);
+        tasks.value.push(created);
+        return created;
+    }
+    async function updateStatut(id, statut) {
+        const t = tasks.value.find(t => t.id === id);
+        if (!t)
+            return;
+        const updated = await tasksApi.update(id, { ...t, statut });
+        Object.assign(t, updated);
+    }
+    async function remove(id) {
+        await tasksApi.delete(id);
+        tasks.value = tasks.value.filter(t => t.id !== id);
+    }
+    return { tasks, loading, fetchAll, create, updateStatut, remove };
+});