feat: add org landing page builder service

New service that generates static Astro landing pages for organizations
and deploys them to Cloudflare Pages at {slug}.mana.how.

Components:
- Landing Builder Service (NestJS, port 3030) with Astro template
- Admin UI in Manacore web dashboard at /organizations/[id]/landing
- TeamSection + ContactSection for shared-landing-ui
- Two org themes (classic dark, warm light)
- LandingPageConfig types in shared-types
- Docker + CI/CD integration for Mac Mini deployment

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

services/mana-landing-builder/src/builder/builder.module.ts

@@ -0,0 +1,9 @@
+import { Module } from '@nestjs/common';
+import { BuilderController } from './builder.controller';
+import { BuilderService } from './builder.service';
+
+@Module({
+	controllers: [BuilderController],
+	providers: [BuilderService],
+})
+export class BuilderModule {}