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/components/TaskStatusDrawer.vue

@@ -38,6 +38,7 @@ import { useTaskStatusService } from '~/services/task-statuses'
 const props = defineProps<{
     modelValue: boolean
     item: TaskStatus | null
+    projectId: number
 }>()
 
 const emit = defineEmits<{
@@ -90,6 +91,7 @@ async function handleSubmit() {
             label: form.label.trim(),
             position: Number(form.position),
             color: form.color,
+            project: `/api/projects/${props.projectId}`,
         }
 
         if (isEditing.value && props.item) {