feat: scaffold center and guild backend NestJS skeletons

Fabric.Backend.Center/src/app.module.ts

@@ -0,0 +1,10 @@
+import { Module } from '@nestjs/common';
+import { HealthController } from './common/health.controller';
+import { AuthModule } from './auth/auth.module';
+import { NodesModule } from './nodes/nodes.module';
+
+@Module({
+  imports: [AuthModule, NodesModule],
+  controllers: [HealthController],
+})
+export class AppModule {}

Fabric.Backend.Center/src/auth/auth.controller.ts

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+import { Body, Controller, Post } from '@nestjs/common';
+
+@Controller('auth')
+export class AuthController {
+  @Post('register')
+  register(@Body() body: Record<string, unknown>) {
+    return { status: 'todo', action: 'register', received: body };
+  }
+
+  @Post('login')
+  login(@Body() body: Record<string, unknown>) {
+    return { status: 'todo', action: 'login', received: body };
+  }
+
+  @Post('refresh')
+  refresh(@Body() body: Record<string, unknown>) {
+    return { status: 'todo', action: 'refresh', received: body };
+  }
+}

Fabric.Backend.Center/src/auth/auth.module.ts

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+import { Module } from '@nestjs/common';
+import { AuthController } from './auth.controller';
+
+@Module({
+  controllers: [AuthController],
+})
+export class AuthModule {}

Fabric.Backend.Center/src/common/health.controller.ts

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+import { Controller, Get } from '@nestjs/common';
+
+@Controller('healthz')
+export class HealthController {
+  @Get()
+  get() {
+    return { ok: true, service: 'center' };
+  }
+}

Fabric.Backend.Center/src/main.ts

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+import 'reflect-metadata';
+import { NestFactory } from '@nestjs/core';
+import { AppModule } from './app.module';
+
+async function bootstrap() {
+  const app = await NestFactory.create(AppModule);
+  app.setGlobalPrefix('api');
+  const port = process.env.PORT ? Number(process.env.PORT) : 7001;
+  await app.listen(port);
+  console.log(`Fabric.Backend.Center listening on :${port}`);
+}
+
+void bootstrap();

Fabric.Backend.Center/src/nodes/nodes.controller.ts

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+import { Body, Controller, Get, Post } from '@nestjs/common';
+
+type NodeRegistration = {
+  nodeId?: string;
+  name?: string;
+  endpoint?: string;
+  handshakeProof?: string;
+};
+
+@Controller('nodes')
+export class NodesController {
+  private readonly nodes: NodeRegistration[] = [];
+
+  @Post('register')
+  register(@Body() body: NodeRegistration) {
+    this.nodes.push(body);
+    return { status: 'accepted', handshake: 'todo-verify-shared-secret', node: body };
+  }
+
+  @Get()
+  list() {
+    return { items: this.nodes };
+  }
+}

Fabric.Backend.Center/src/nodes/nodes.module.ts

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+import { Module } from '@nestjs/common';
+import { NodesController } from './nodes.controller';
+
+@Module({
+  controllers: [NodesController],
+})
+export class NodesModule {}