feat(m4): project & member management with tests and e2e

- ProjectRepository, ProjectMemberRepository, minimal NotificationRepository
- ProjectService: create/update/archive/delete project, add/remove member,
  permission checks (isMember/admin), member-added notification, getDashboard
  skeleton, getMyProjects, getMemberRole
- projectValidator, API services factory
- API routes: projects CRUD, members list/add/remove
- Screens: dashboard (project list + create form), project overview, members,
  settings; layout (Header/Sidebar/ProjectNav) and project components
- Unit tests (Project/ProjectMember repositories, ProjectService),
  integration project-member-permission, e2e project-management

lib/api/services.ts

@@ -0,0 +1,24 @@
+import { getDb } from '@/lib/db/sqlite';
+import { ProjectRepository } from '@/repositories/ProjectRepository';
+import { ProjectMemberRepository } from '@/repositories/ProjectMemberRepository';
+import { NotificationRepository } from '@/repositories/NotificationRepository';
+import { UserRepository } from '@/repositories/UserRepository';
+import { ProjectService } from '@/services/ProjectService';
+
+/**
+ * Route Handler用に各Repository/Serviceを構築するファクトリ。
+ * 依存はすべて同じgetDb()接続を共有し、トランザクション境界を機能させる。
+ */
+export function createProjectService(): ProjectService {
+  const db = getDb();
+  return new ProjectService(
+    new ProjectRepository(db),
+    new ProjectMemberRepository(db),
+    new NotificationRepository(db),
+    db
+  );
+}
+
+export function createUserRepository(): UserRepository {
+  return new UserRepository(getDb());
+}