feat(#1): Set up monorepo scaffold with pnpm workspaces + TurboRepo

Implements the foundational project structure including:
- pnpm workspaces configuration
- TurboRepo for build orchestration
- NestJS 11.1.12 API (apps/api)
- Next.js 16.1.6 web app (apps/web)
- Shared packages (config, shared, ui)
- TypeScript strict mode configuration
- ESLint + Prettier setup
- Vitest for unit testing (19 passing tests)

Fixes #1

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/src/app.controller.d.ts

@@ -0,0 +1,14 @@
+import { AppService } from "./app.service";
+import type { ApiResponse } from "@mosaic/shared/types";
+interface HealthStatus {
+    status: string;
+    timestamp: string;
+}
+export declare class AppController {
+    private readonly appService;
+    constructor(appService: AppService);
+    getHello(): string;
+    getHealth(): ApiResponse<HealthStatus>;
+}
+export {};
+//# sourceMappingURL=app.controller.d.ts.map

apps/api/src/app.controller.d.ts.map

@@ -0,0 +1 @@
+{"version":3,"file":"app.controller.d.ts","sourceRoot":"","sources":["app.controller.ts"],"names":[],"mappings":"AACA,OAAO,EAAE,UAAU,EAAE,MAAM,eAAe,CAAC;AAC3C,OAAO,KAAK,EAAE,WAAW,EAAE,MAAM,sBAAsB,CAAC;AAExD,UAAU,YAAY;IACpB,MAAM,EAAE,MAAM,CAAC;IACf,SAAS,EAAE,MAAM,CAAC;CACnB;AAED,qBACa,aAAa;IACZ,OAAO,CAAC,QAAQ,CAAC,UAAU;gBAAV,UAAU,EAAE,UAAU;IAGnD,QAAQ,IAAI,MAAM;IAKlB,SAAS,IAAI,WAAW,CAAC,YAAY,CAAC;CASvC"}

apps/api/src/app.controller.js

@@ -0,0 +1,50 @@
+"use strict";
+var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
+    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
+    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
+    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
+    return c > 3 && r && Object.defineProperty(target, key, r), r;
+};
+var __metadata = (this && this.__metadata) || function (k, v) {
+    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.AppController = void 0;
+const common_1 = require("@nestjs/common");
+const app_service_1 = require("./app.service");
+let AppController = class AppController {
+    appService;
+    constructor(appService) {
+        this.appService = appService;
+    }
+    getHello() {
+        return this.appService.getHello();
+    }
+    getHealth() {
+        return {
+            success: true,
+            data: {
+                status: "healthy",
+                timestamp: new Date().toISOString(),
+            },
+        };
+    }
+};
+exports.AppController = AppController;
+__decorate([
+    (0, common_1.Get)(),
+    __metadata("design:type", Function),
+    __metadata("design:paramtypes", []),
+    __metadata("design:returntype", String)
+], AppController.prototype, "getHello", null);
+__decorate([
+    (0, common_1.Get)("health"),
+    __metadata("design:type", Function),
+    __metadata("design:paramtypes", []),
+    __metadata("design:returntype", Object)
+], AppController.prototype, "getHealth", null);
+exports.AppController = AppController = __decorate([
+    (0, common_1.Controller)(),
+    __metadata("design:paramtypes", [app_service_1.AppService])
+], AppController);
+//# sourceMappingURL=app.controller.js.map

apps/api/src/app.controller.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"app.controller.js","sourceRoot":"","sources":["app.controller.ts"],"names":[],"mappings":";;;;;;;;;;;;AAAA,2CAAiD;AACjD,+CAA2C;AASpC,IAAM,aAAa,GAAnB,MAAM,aAAa;IACK;IAA7B,YAA6B,UAAsB;QAAtB,eAAU,GAAV,UAAU,CAAY;IAAG,CAAC;IAGvD,QAAQ;QACN,OAAO,IAAI,CAAC,UAAU,CAAC,QAAQ,EAAE,CAAC;IACpC,CAAC;IAGD,SAAS;QACP,OAAO;YACL,OAAO,EAAE,IAAI;YACb,IAAI,EAAE;gBACJ,MAAM,EAAE,SAAS;gBACjB,SAAS,EAAE,IAAI,IAAI,EAAE,CAAC,WAAW,EAAE;aACpC;SACF,CAAC;IACJ,CAAC;CACF,CAAA;AAlBY,sCAAa;AAIxB;IADC,IAAA,YAAG,GAAE;;;;6CAGL;AAGD;IADC,IAAA,YAAG,EAAC,QAAQ,CAAC;;;;8CASb;wBAjBU,aAAa;IADzB,IAAA,mBAAU,GAAE;qCAE8B,wBAAU;GADxC,aAAa,CAkBzB"}

apps/api/src/app.controller.test.ts

@@ -0,0 +1,31 @@
+import { describe, expect, it } from "vitest";
+import { AppService } from "./app.service";
+import { AppController } from "./app.controller";
+
+describe("AppController", () => {
+  const appService = new AppService();
+  const controller = new AppController(appService);
+
+  describe("getHello", () => {
+    it('should return "Mosaic Stack API"', () => {
+      expect(controller.getHello()).toBe("Mosaic Stack API");
+    });
+  });
+
+  describe("getHealth", () => {
+    it("should return health status", () => {
+      const result = controller.getHealth();
+      expect(result.success).toBe(true);
+      expect(result.data.status).toBe("healthy");
+      expect(result.data.timestamp).toBeDefined();
+    });
+  });
+});
+
+describe("AppService", () => {
+  const service = new AppService();
+
+  it('should return "Mosaic Stack API"', () => {
+    expect(service.getHello()).toBe("Mosaic Stack API");
+  });
+});

apps/api/src/app.controller.ts

@@ -0,0 +1,29 @@
+import { Controller, Get } from "@nestjs/common";
+import { AppService } from "./app.service";
+import type { ApiResponse } from "@mosaic/shared";
+
+interface HealthStatus {
+  status: string;
+  timestamp: string;
+}
+
+@Controller()
+export class AppController {
+  constructor(private readonly appService: AppService) {}
+
+  @Get()
+  getHello(): string {
+    return this.appService.getHello();
+  }
+
+  @Get("health")
+  getHealth(): ApiResponse<HealthStatus> {
+    return {
+      success: true,
+      data: {
+        status: "healthy",
+        timestamp: new Date().toISOString(),
+      },
+    };
+  }
+}

apps/api/src/app.module.d.ts

@@ -0,0 +1,3 @@
+export declare class AppModule {
+}
+//# sourceMappingURL=app.module.d.ts.map

apps/api/src/app.module.d.ts.map

@@ -0,0 +1 @@
+{"version":3,"file":"app.module.d.ts","sourceRoot":"","sources":["app.module.ts"],"names":[],"mappings":"AAIA,qBAKa,SAAS;CAAG"}

apps/api/src/app.module.js

@@ -0,0 +1,23 @@
+"use strict";
+var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
+    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
+    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
+    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
+    return c > 3 && r && Object.defineProperty(target, key, r), r;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.AppModule = void 0;
+const common_1 = require("@nestjs/common");
+const app_controller_1 = require("./app.controller");
+const app_service_1 = require("./app.service");
+let AppModule = class AppModule {
+};
+exports.AppModule = AppModule;
+exports.AppModule = AppModule = __decorate([
+    (0, common_1.Module)({
+        imports: [],
+        controllers: [app_controller_1.AppController],
+        providers: [app_service_1.AppService],
+    })
+], AppModule);
+//# sourceMappingURL=app.module.js.map

apps/api/src/app.module.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"app.module.js","sourceRoot":"","sources":["app.module.ts"],"names":[],"mappings":";;;;;;;;;AAAA,2CAAwC;AACxC,qDAAiD;AACjD,+CAA2C;AAOpC,IAAM,SAAS,GAAf,MAAM,SAAS;CAAG,CAAA;AAAZ,8BAAS;oBAAT,SAAS;IALrB,IAAA,eAAM,EAAC;QACN,OAAO,EAAE,EAAE;QACX,WAAW,EAAE,CAAC,8BAAa,CAAC;QAC5B,SAAS,EAAE,CAAC,wBAAU,CAAC;KACxB,CAAC;GACW,SAAS,CAAG"}

apps/api/src/app.module.ts

@@ -0,0 +1,10 @@
+import { Module } from "@nestjs/common";
+import { AppController } from "./app.controller";
+import { AppService } from "./app.service";
+
+@Module({
+  imports: [],
+  controllers: [AppController],
+  providers: [AppService],
+})
+export class AppModule {}

apps/api/src/app.service.d.ts

@@ -0,0 +1,4 @@
+export declare class AppService {
+    getHello(): string;
+}
+//# sourceMappingURL=app.service.d.ts.map

apps/api/src/app.service.d.ts.map

@@ -0,0 +1 @@
+{"version":3,"file":"app.service.d.ts","sourceRoot":"","sources":["app.service.ts"],"names":[],"mappings":"AAEA,qBACa,UAAU;IACrB,QAAQ,IAAI,MAAM;CAGnB"}

apps/api/src/app.service.js

@@ -0,0 +1,20 @@
+"use strict";
+var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
+    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
+    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
+    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
+    return c > 3 && r && Object.defineProperty(target, key, r), r;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.AppService = void 0;
+const common_1 = require("@nestjs/common");
+let AppService = class AppService {
+    getHello() {
+        return "Mosaic Stack API";
+    }
+};
+exports.AppService = AppService;
+exports.AppService = AppService = __decorate([
+    (0, common_1.Injectable)()
+], AppService);
+//# sourceMappingURL=app.service.js.map

apps/api/src/app.service.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"app.service.js","sourceRoot":"","sources":["app.service.ts"],"names":[],"mappings":";;;;;;;;;AAAA,2CAA4C;AAGrC,IAAM,UAAU,GAAhB,MAAM,UAAU;IACrB,QAAQ;QACN,OAAO,kBAAkB,CAAC;IAC5B,CAAC;CACF,CAAA;AAJY,gCAAU;qBAAV,UAAU;IADtB,IAAA,mBAAU,GAAE;GACA,UAAU,CAItB"}

apps/api/src/app.service.ts

@@ -0,0 +1,8 @@
+import { Injectable } from "@nestjs/common";
+
+@Injectable()
+export class AppService {
+  getHello(): string {
+    return "Mosaic Stack API";
+  }
+}

apps/api/src/main.d.ts

@@ -0,0 +1,2 @@
+export {};
+//# sourceMappingURL=main.d.ts.map

apps/api/src/main.d.ts.map

@@ -0,0 +1 @@
+{"version":3,"file":"main.d.ts","sourceRoot":"","sources":["main.ts"],"names":[],"mappings":""}

apps/api/src/main.js

@@ -0,0 +1,16 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const core_1 = require("@nestjs/core");
+const app_module_1 = require("./app.module");
+async function bootstrap() {
+    const app = await core_1.NestFactory.create(app_module_1.AppModule);
+    app.enableCors();
+    const port = process.env["PORT"] ?? 3001;
+    await app.listen(port);
+    console.log(`API running on http://localhost:${port}`);
+}
+bootstrap().catch((err) => {
+    console.error("Failed to start application:", err);
+    process.exit(1);
+});
+//# sourceMappingURL=main.js.map

apps/api/src/main.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"main.js","sourceRoot":"","sources":["main.ts"],"names":[],"mappings":";;AAAA,uCAA2C;AAC3C,6CAAyC;AAEzC,KAAK,UAAU,SAAS;IACtB,MAAM,GAAG,GAAG,MAAM,kBAAW,CAAC,MAAM,CAAC,sBAAS,CAAC,CAAC;IAChD,GAAG,CAAC,UAAU,EAAE,CAAC;IAEjB,MAAM,IAAI,GAAG,OAAO,CAAC,GAAG,CAAC,MAAM,CAAC,IAAI,IAAI,CAAC;IACzC,MAAM,GAAG,CAAC,MAAM,CAAC,IAAI,CAAC,CAAC;IAEvB,OAAO,CAAC,GAAG,CAAC,mCAAmC,IAAI,EAAE,CAAC,CAAC;AACzD,CAAC;AAED,SAAS,EAAE,CAAC,KAAK,CAAC,CAAC,GAAY,EAAE,EAAE;IACjC,OAAO,CAAC,KAAK,CAAC,8BAA8B,EAAE,GAAG,CAAC,CAAC;IACnD,OAAO,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC;AAClB,CAAC,CAAC,CAAC"}

apps/api/src/main.ts

@@ -0,0 +1,17 @@
+import { NestFactory } from "@nestjs/core";
+import { AppModule } from "./app.module";
+
+async function bootstrap() {
+  const app = await NestFactory.create(AppModule);
+  app.enableCors();
+
+  const port = process.env["PORT"] ?? 3001;
+  await app.listen(port);
+
+  console.log(`API running on http://localhost:${port}`);
+}
+
+bootstrap().catch((err: unknown) => {
+  console.error("Failed to start application:", err);
+  process.exit(1);
+});