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/services/dto/task-status.ts

@@ -1,13 +1,17 @@
+import type { Project } from './project'
+
 export type TaskStatus = {
     id: number
     '@id'?: string
     label: string
     color: string
     position: number
+    project: Project | null
 }
 
 export type TaskStatusWrite = {
     label: string
     color: string
     position: number
+    project: string
 }