feat(gateway): WorkspaceService + ProjectBootstrapService + TeamsService (P8-015)

- WorkspaceService: path resolution, git init/clone, directory lifecycle (create/delete/exists), user and team root provisioning
- ProjectBootstrapService: orchestrates DB record creation (via Brain) + workspace directory init in a single call
- TeamsService: isMember, canAccessProject, findAll, findById, listMembers via Drizzle DB queries
- WorkspaceController: POST /api/workspaces — auth-guarded project bootstrap endpoint
- TeamsController: GET /api/teams, /:teamId, /:teamId/members, /:teamId/members/:userId
- WorkspaceModule wired into AppModule
- workspace.service.spec.ts: 5 unit tests for resolvePath (user, team, fallback, env var, default)

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

apps/gateway/src/workspace/project-bootstrap.service.ts

@@ -0,0 +1,63 @@
+import { Inject, Injectable, Logger } from '@nestjs/common';
+import type { Brain } from '@mosaic/brain';
+import { BRAIN } from '../brain/brain.tokens.js';
+import { WorkspaceService } from './workspace.service.js';
+
+export interface BootstrapProjectParams {
+  name: string;
+  description?: string;
+  userId: string;
+  teamId?: string;
+  repoUrl?: string;
+}
+
+export interface BootstrapProjectResult {
+  projectId: string;
+  workspacePath: string;
+}
+
+@Injectable()
+export class ProjectBootstrapService {
+  private readonly logger = new Logger(ProjectBootstrapService.name);
+
+  constructor(
+    @Inject(BRAIN) private readonly brain: Brain,
+    private readonly workspace: WorkspaceService,
+  ) {}
+
+  /**
+   * Bootstrap a new project: create DB record + workspace directory.
+   * Returns the created project with its workspace path.
+   */
+  async bootstrap(params: BootstrapProjectParams): Promise<BootstrapProjectResult> {
+    const ownerType: 'user' | 'team' = params.teamId ? 'team' : 'user';
+
+    this.logger.log(
+      `Bootstrapping project "${params.name}" for ${ownerType} ${params.teamId ?? params.userId}`,
+    );
+
+    // 1. Create DB record
+    const project = await this.brain.projects.create({
+      name: params.name,
+      description: params.description,
+      ownerId: params.userId,
+      teamId: params.teamId ?? null,
+      ownerType,
+    });
+
+    // 2. Create workspace directory
+    const workspacePath = await this.workspace.create(
+      {
+        id: project.id,
+        ownerType,
+        userId: params.userId,
+        teamId: params.teamId ?? null,
+      },
+      params.repoUrl,
+    );
+
+    this.logger.log(`Project ${project.id} bootstrapped at ${workspacePath}`);
+
+    return { projectId: project.id, workspacePath };
+  }
+}