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.controller.ts

@@ -0,0 +1,22 @@
+import { Controller, Post, Body, Get, Logger, HttpCode } from '@nestjs/common';
+import { BuilderService, type BuildResult } from './builder.service';
+import { BuildLandingDto } from './dto/build-landing.dto';
+
+@Controller()
+export class BuilderController {
+	private readonly logger = new Logger(BuilderController.name);
+
+	constructor(private readonly builderService: BuilderService) {}
+
+	@Post('build')
+	@HttpCode(200)
+	async buildLanding(@Body() dto: BuildLandingDto): Promise<BuildResult> {
+		this.logger.log(`Build requested for org: ${dto.slug}`);
+		return this.builderService.build(dto);
+	}
+
+	@Get('health')
+	health() {
+		return { status: 'ok', service: 'mana-landing-builder' };
+	}
+}