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

repositories/ProjectRepository.ts

@@ -0,0 +1,126 @@
+import type { SqliteDatabase } from '@/lib/db/sqlite';
+import type { Project, ProjectStatus } from '@/lib/types';
+
+interface ProjectRow {
+  id: number;
+  name: string;
+  description: string | null;
+  status: string;
+  owner_id: number;
+  created_at: string;
+  updated_at: string;
+}
+
+function mapProject(row: ProjectRow): Project {
+  return {
+    id: row.id,
+    name: row.name,
+    description: row.description,
+    status: row.status as ProjectStatus,
+    ownerId: row.owner_id,
+    createdAt: row.created_at,
+    updatedAt: row.updated_at,
+  };
+}
+
+export interface CreateProjectInput {
+  name: string;
+  description?: string;
+  ownerId: number;
+}
+
+export interface UpdateProjectInput {
+  name?: string;
+  description?: string | null;
+  status?: ProjectStatus;
+}
+
+/**
+ * projectsテーブルへのデータアクセスを担うRepository。
+ */
+export class ProjectRepository {
+  constructor(private readonly db: SqliteDatabase) {}
+
+  findById(id: number): Project | null {
+    const row = this.db.get<ProjectRow>(
+      'SELECT * FROM projects WHERE id = @id',
+      { id }
+    );
+    return row ? mapProject(row) : null;
+  }
+
+  findByOwner(ownerId: number): Project[] {
+    const rows = this.db.query<ProjectRow>(
+      'SELECT * FROM projects WHERE owner_id = @ownerId ORDER BY id',
+      { ownerId }
+    );
+    return rows.map(mapProject);
+  }
+
+  /** ユーザーが参加しているプロジェクト一覧を取得する */
+  findProjectsByUserId(userId: number): Project[] {
+    const rows = this.db.query<ProjectRow>(
+      `SELECT p.* FROM projects p
+       INNER JOIN project_members pm ON pm.project_id = p.id
+       WHERE pm.user_id = @userId
+       ORDER BY p.id`,
+      { userId }
+    );
+    return rows.map(mapProject);
+  }
+
+  create(input: CreateProjectInput): Project {
+    const now = new Date().toISOString();
+    const result = this.db.execute(
+      `INSERT INTO projects (name, description, status, owner_id, created_at, updated_at)
+       VALUES (@name, @description, @status, @ownerId, @createdAt, @updatedAt)`,
+      {
+        name: input.name,
+        description: input.description ?? null,
+        status: 'active',
+        ownerId: input.ownerId,
+        createdAt: now,
+        updatedAt: now,
+      }
+    );
+    const created = this.findById(Number(result.lastInsertRowid));
+    if (!created) {
+      throw new Error('Failed to create project');
+    }
+    return created;
+  }
+
+  update(id: number, input: UpdateProjectInput): Project | null {
+    const fields: string[] = ['updated_at = @updatedAt'];
+    const params: Record<string, unknown> = {
+      updatedAt: new Date().toISOString(),
+      id,
+    };
+
+    if (input.name !== undefined) {
+      fields.push('name = @name');
+      params.name = input.name;
+    }
+    if (input.description !== undefined) {
+      fields.push('description = @description');
+      params.description = input.description;
+    }
+    if (input.status !== undefined) {
+      fields.push('status = @status');
+      params.status = input.status;
+    }
+
+    this.db.execute(
+      `UPDATE projects SET ${fields.join(', ')} WHERE id = @id`,
+      params
+    );
+    return this.findById(id);
+  }
+
+  delete(id: number): boolean {
+    const result = this.db.execute('DELETE FROM projects WHERE id = @id', {
+      id,
+    });
+    return result.changes > 0;
+  }
+}