feat: scaffold center and guild backend NestJS skeletons

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

@@ -0,0 +1,11 @@
+import { Module } from '@nestjs/common';
+import { HealthController } from './common/health.controller';
+import { GuildsModule } from './guilds/guilds.module';
+import { ChannelsModule } from './channels/channels.module';
+import { MessagingModule } from './messaging/messaging.module';
+
+@Module({
+  imports: [GuildsModule, ChannelsModule, MessagingModule],
+  controllers: [HealthController],
+})
+export class AppModule {}

Fabric.Backend.Guild/src/channels/channels.controller.ts

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+import { Body, Controller, Post } from '@nestjs/common';
+
+@Controller('channels')
+export class ChannelsController {
+  @Post()
+  create(@Body() body: Record<string, unknown>) {
+    return { status: 'todo', action: 'create-channel', received: body };
+  }
+}

Fabric.Backend.Guild/src/channels/channels.module.ts

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+import { Module } from '@nestjs/common';
+import { ChannelsController } from './channels.controller';
+
+@Module({
+  controllers: [ChannelsController],
+})
+export class ChannelsModule {}

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

@@ -0,0 +1,9 @@
+import { Controller, Get } from '@nestjs/common';
+
+@Controller('healthz')
+export class HealthController {
+  @Get()
+  get() {
+    return { ok: true, service: 'guild' };
+  }
+}

Fabric.Backend.Guild/src/guilds/guilds.controller.ts

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+import { Body, Controller, Post } from '@nestjs/common';
+
+@Controller('guilds')
+export class GuildsController {
+  @Post()
+  create(@Body() body: Record<string, unknown>) {
+    return { status: 'todo', action: 'create-guild', received: body };
+  }
+}

Fabric.Backend.Guild/src/guilds/guilds.module.ts

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+import { Module } from '@nestjs/common';
+import { GuildsController } from './guilds.controller';
+
+@Module({
+  controllers: [GuildsController],
+})
+export class GuildsModule {}

Fabric.Backend.Guild/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) : 7002;
+  await app.listen(port);
+  console.log(`Fabric.Backend.Guild listening on :${port}`);
+}
+
+void bootstrap();

Fabric.Backend.Guild/src/messaging/messaging.controller.ts

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+import { Body, Controller, Delete, Get, Param, Patch, Post, Query } from '@nestjs/common';
+
+type Message = {
+  messageId: string;
+  seq: number;
+  content: string;
+};
+
+@Controller('channels/:id/messages')
+export class MessagingController {
+  private seqByChannel = new Map<string, number>();
+  private messagesByChannel = new Map<string, Message[]>();
+
+  @Post()
+  create(@Param('id') channelId: string, @Body() body: { content?: string; messageId?: string }) {
+    const next = (this.seqByChannel.get(channelId) ?? 0) + 1;
+    this.seqByChannel.set(channelId, next);
+
+    const message: Message = {
+      messageId: body.messageId ?? `m-${channelId}-${next}`,
+      seq: next,
+      content: body.content ?? '',
+    };
+
+    const arr = this.messagesByChannel.get(channelId) ?? [];
+    arr.push(message);
+    this.messagesByChannel.set(channelId, arr);
+
+    return message;
+  }
+
+  @Patch(':messageId')
+  edit(@Param('id') channelId: string, @Param('messageId') messageId: string, @Body() body: { content?: string }) {
+    const arr = this.messagesByChannel.get(channelId) ?? [];
+    const item = arr.find((m) => m.messageId === messageId);
+    if (!item) return { status: 'not_found' };
+    item.content = body.content ?? item.content;
+    return item;
+  }
+
+  @Delete(':messageId')
+  remove(@Param('id') channelId: string, @Param('messageId') messageId: string) {
+    const arr = this.messagesByChannel.get(channelId) ?? [];
+    const next = arr.filter((m) => m.messageId !== messageId);
+    this.messagesByChannel.set(channelId, next);
+    return { status: 'deleted', messageId };
+  }
+
+  @Get()
+  listBySeq(
+    @Param('id') channelId: string,
+    @Query('seq_from') seqFrom?: string,
+    @Query('seq_to') seqTo?: string,
+  ) {
+    const from = seqFrom ? Number(seqFrom) : 1;
+    const to = seqTo ? Number(seqTo) : Number.MAX_SAFE_INTEGER;
+    const arr = this.messagesByChannel.get(channelId) ?? [];
+    return {
+      items: arr.filter((m) => m.seq >= from && m.seq <= to),
+    };
+  }
+}

Fabric.Backend.Guild/src/messaging/messaging.module.ts

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+import { Module } from '@nestjs/common';
+import { MessagingController } from './messaging.controller';
+
+@Module({
+  controllers: [MessagingController],
+})
+export class MessagingModule {}