feat(projects) : add per-project task statuses and split project detail into sub-pages

Move project detail from [id].vue to [id]/ directory with Kanban, Groups
and Statuses sub-pages. Add project filter on task statuses service and
drawer. Remove global statuses tab from admin.

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

frontend/pages/projects/[id]/groups.vue

@@ -0,0 +1,32 @@
+<template>
+    <div>
+        <div class="flex items-center justify-between">
+            <h1 class="text-2xl font-bold text-neutral-900">{{ project?.name ?? '' }} — Groupes</h1>
+        </div>
+
+        <div class="mt-6">
+            <ProjectGroupTab :project-id="projectId" />
+        </div>
+    </div>
+</template>
+
+<script setup lang="ts">
+import type { Project } from '~/services/dto/project'
+import { useProjectService } from '~/services/projects'
+
+const route = useRoute()
+const projectId = computed(() => Number(route.params.id))
+
+useHead({ title: 'Groupes du projet' })
+
+const projectService = useProjectService()
+const project = ref<Project | null>(null)
+
+async function loadProject() {
+    project.value = await projectService.getById(projectId.value)
+}
+
+onMounted(() => {
+    loadProject()
+})
+</script>