feat(api): early-access signup endpoint (POST /api/early-access)

Real @Public() NestJS endpoint persisting to the existing early_access_signups table (email + server_count), matching the schema exactly (no migration). Duplicate-email safe (pre-check + unique-constraint catch -> friendly success). Wired into app.module. Makes the marketing early-access form functional end-to-end on next API deploy. tsc/nest build green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend-nest/src/app.module.ts

@@ -44,6 +44,7 @@ import { FurnaceSplitterModule } from './modules/furnacesplitter/furnacesplitter
 import { BetterChatModule } from './modules/betterchat/betterchat.module';
 import { TimedExecuteModule } from './modules/timedexecute/timedexecute.module';
 import { RaidableBasesModule } from './modules/raidablebases/raidablebases.module';
+import { EarlyAccessModule } from './modules/early-access/early-access.module';
 
 // Shared Services
 import { NatsService } from './services/nats.service';
@@ -123,6 +124,7 @@ import { NatsBridgeGateway } from './gateways/nats-bridge.gateway';
     BetterChatModule,
     TimedExecuteModule,
     RaidableBasesModule,
+    EarlyAccessModule,
   ],
   providers: [
     // Global guards (order matters: auth first, then license, then permissions)

backend-nest/src/modules/early-access/dto/create-early-access.dto.ts

@@ -0,0 +1,14 @@
+import { IsEmail, IsOptional, IsString, MaxLength } from 'class-validator';
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+
+export class CreateEarlyAccessDto {
+  @ApiProperty({ example: 'admin@example.com' })
+  @IsEmail()
+  email: string;
+
+  @ApiPropertyOptional({ example: 'rust', description: 'Primary game interest or server count' })
+  @IsOptional()
+  @IsString()
+  @MaxLength(10)
+  server_count?: string;
+}

backend-nest/src/modules/early-access/early-access.controller.ts

@@ -0,0 +1,19 @@
+import { Body, Controller, HttpCode, HttpStatus, Post } from '@nestjs/common';
+import { ApiOperation, ApiTags } from '@nestjs/swagger';
+import { Public } from '../../common/decorators/public.decorator';
+import { EarlyAccessService } from './early-access.service';
+import { CreateEarlyAccessDto } from './dto/create-early-access.dto';
+
+@ApiTags('early-access')
+@Controller()
+export class EarlyAccessController {
+  constructor(private readonly earlyAccessService: EarlyAccessService) {}
+
+  @Public()
+  @Post('early-access')
+  @HttpCode(HttpStatus.OK)
+  @ApiOperation({ summary: 'Register for early access' })
+  async register(@Body() dto: CreateEarlyAccessDto) {
+    return this.earlyAccessService.register(dto);
+  }
+}

backend-nest/src/modules/early-access/early-access.module.ts

@@ -0,0 +1,12 @@
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { EarlyAccessSignup } from '../../entities/early-access-signup.entity';
+import { EarlyAccessController } from './early-access.controller';
+import { EarlyAccessService } from './early-access.service';
+
+@Module({
+  imports: [TypeOrmModule.forFeature([EarlyAccessSignup])],
+  controllers: [EarlyAccessController],
+  providers: [EarlyAccessService],
+})
+export class EarlyAccessModule {}

backend-nest/src/modules/early-access/early-access.service.ts

@@ -0,0 +1,42 @@
+import { Injectable, Logger } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { EarlyAccessSignup } from '../../entities/early-access-signup.entity';
+import { CreateEarlyAccessDto } from './dto/create-early-access.dto';
+
+@Injectable()
+export class EarlyAccessService {
+  private readonly logger = new Logger(EarlyAccessService.name);
+
+  constructor(
+    @InjectRepository(EarlyAccessSignup)
+    private readonly repo: Repository<EarlyAccessSignup>,
+  ) {}
+
+  async register(dto: CreateEarlyAccessDto): Promise<{ success: true; alreadyRegistered: boolean }> {
+    const existing = await this.repo.findOne({ where: { email: dto.email } });
+    if (existing) {
+      // Duplicate email — return friendly success rather than a 409 that would break the UX
+      return { success: true, alreadyRegistered: true };
+    }
+
+    const signup = this.repo.create({
+      email: dto.email,
+      server_count: dto.server_count ?? 'not specified',
+    });
+
+    try {
+      await this.repo.save(signup);
+    } catch (err: unknown) {
+      // Guard against a race-condition duplicate (unique constraint violation)
+      const pg = err as { code?: string };
+      if (pg.code === '23505') {
+        return { success: true, alreadyRegistered: true };
+      }
+      this.logger.error('Failed to save early-access signup', err);
+      throw err;
+    }
+
+    return { success: true, alreadyRegistered: false };
+  }
+}