feat(canvas): brand tech icons on services, matching site preview

Resolve a service's tech (postgres, redis, go, node, nginx, kafka,
~50 slugs) from its image/name and render the Simple Icons logo in
the tinted icon tile — canvas nodes, inspector, service detail
header, and database rows — with graceful fallback to type icons.
Demo services get resolvable images, ports, and domains; a Redis
Cache service joins Core Platform so the demo canvas mirrors the
landing preview (5 services, web/api/worker → api → postgres/redis).

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

app/frontend/src/features/workspace/canvas/service-visuals.tsx

@@ -29,3 +29,84 @@ export function serviceTypeColor(type: string): string {
       return '#9295a4';
   }
 }
+
+export type ServiceBrandIcon = {
+  slug: string;
+  color: string;
+};
+
+const TECH_ICONS: (ServiceBrandIcon & { patterns: RegExp[] })[] = [
+  { slug: 'postgresql', color: '#7ab8ff', patterns: [/postgres/i, /postgis/i] },
+  { slug: 'redis', color: '#ff6b6b', patterns: [/redis/i, /dragonfly/i, /valkey/i, /keydb/i] },
+  { slug: 'mysql', color: '#5ba4e5', patterns: [/mysql/i] },
+  { slug: 'mariadb', color: '#4ea5ff', patterns: [/mariadb/i] },
+  { slug: 'mongodb', color: '#47a248', patterns: [/mongo/i] },
+  { slug: 'clickhouse', color: '#ffcc01', patterns: [/clickhouse/i] },
+  { slug: 'couchdb', color: '#e42528', patterns: [/couchdb/i] },
+  { slug: 'sqlite', color: '#69b7e4', patterns: [/sqlite/i] },
+  { slug: 'influxdb', color: '#22adf6', patterns: [/influx/i] },
+  { slug: 'elasticsearch', color: '#fec514', patterns: [/elastic/i, /opensearch/i] },
+  { slug: 'meilisearch', color: '#ff5caa', patterns: [/meili/i] },
+  { slug: 'typesense', color: '#d90368', patterns: [/typesense/i] },
+  { slug: 'qdrant', color: '#dc244c', patterns: [/qdrant/i] },
+  { slug: 'weaviate', color: '#01c9a7', patterns: [/weaviate/i] },
+  { slug: 'minio', color: '#c72e49', patterns: [/minio/i] },
+  { slug: 'rabbitmq', color: '#ff6600', patterns: [/rabbitmq/i, /rabbit/i] },
+  { slug: 'apachekafka', color: '#d6dae4', patterns: [/kafka/i] },
+  { slug: 'natsdotio', color: '#8be1d3', patterns: [/\bnats/i] },
+  { slug: 'nginx', color: '#009639', patterns: [/nginx/i] },
+  { slug: 'caddy', color: '#1f88c0', patterns: [/caddy/i] },
+  { slug: 'traefikproxy', color: '#24a1c1', patterns: [/traefik/i] },
+  { slug: 'nodedotjs', color: '#5fa04e', patterns: [/node(?=[:\-\d]|$)/i, /nodejs/i] },
+  { slug: 'go', color: '#00add8', patterns: [/golang/i, /(?:^|[^a-z])go(?=[:\-\d]|$)/i] },
+  { slug: 'python', color: '#6fa8dc', patterns: [/python/i, /\bpy(?:thon)?(?=[:\-\d]|$)/i] },
+  { slug: 'rust', color: '#f74c00', patterns: [/rust/i] },
+  { slug: 'php', color: '#8892bf', patterns: [/php/i] },
+  { slug: 'ruby', color: '#cc342d', patterns: [/ruby/i, /rails/i] },
+  { slug: 'openjdk', color: '#e6a23c', patterns: [/java/i, /openjdk/i, /jdk/i, /jre/i] },
+  { slug: 'dotnet', color: '#6f4bd8', patterns: [/dotnet/i, /aspnet/i] },
+  { slug: 'deno', color: '#70ffaf', patterns: [/\bdeno/i] },
+  { slug: 'bun', color: '#f9f1e1', patterns: [/bun(?=[:\-\d]|$)/i] },
+  { slug: 'react', color: '#61dafb', patterns: [/react/i] },
+  { slug: 'vuedotjs', color: '#4fc08d', patterns: [/vue/i] },
+  { slug: 'angular', color: '#dd0031', patterns: [/angular/i] },
+  { slug: 'svelte', color: '#ff3e00', patterns: [/svelte/i] },
+  { slug: 'nextdotjs', color: '#e6edf3', patterns: [/nextjs/i, /next\.js/i] },
+  { slug: 'nuxtdotjs', color: '#00dc82', patterns: [/nuxt/i] },
+  { slug: 'astro', color: '#ff5d01', patterns: [/astro/i] },
+  { slug: 'prometheus', color: '#e6522c', patterns: [/prometheus/i] },
+  { slug: 'grafana', color: '#f46800', patterns: [/grafana/i] },
+  { slug: 'uptimekuma', color: '#5cdd8b', patterns: [/uptime.?kuma/i, /\bkuma/i] },
+  { slug: 'n8n', color: '#ea4b71', patterns: [/n8n/i] },
+  { slug: 'wordpress', color: '#4b9cd3', patterns: [/wordpress/i, /\bwp-/i] },
+  { slug: 'ghost', color: '#a8b8c4', patterns: [/ghost/i] },
+  { slug: 'nextcloud', color: '#0082c9', patterns: [/nextcloud/i] },
+  { slug: 'immich', color: '#7c9ef5', patterns: [/immich/i] },
+  { slug: 'supabase', color: '#3fcf8e', patterns: [/supabase/i] },
+  { slug: 'pocketbase', color: '#b8dbe4', patterns: [/pocketbase/i] },
+  { slug: 'keycloak', color: '#d6dae4', patterns: [/keycloak/i] },
+  { slug: 'authentik', color: '#fd4b2d', patterns: [/authentik/i] },
+  { slug: 'portainer', color: '#13bef9', patterns: [/portainer/i] },
+  { slug: 'docker', color: '#2496ed', patterns: [/docker/i, /dind/i] },
+  { slug: 'kubernetes', color: '#326ce5', patterns: [/kubernetes/i, /\bk8s/i] },
+];
+
+export type ServiceIconInput = { image?: string; name?: string; type?: string };
+
+export function serviceIcon(service: ServiceIconInput): ServiceBrandIcon | null {
+  const text = `${service.image ?? ''} ${service.name ?? ''}`.toLowerCase();
+  for (const icon of TECH_ICONS) {
+    if (icon.patterns.some((pattern) => pattern.test(text))) {
+      return icon;
+    }
+  }
+  return null;
+}
+
+export function serviceIconUrl(icon: ServiceBrandIcon): string {
+  return `https://cdn.simpleicons.org/${icon.slug}/${icon.color.replace('#', '')}`;
+}
+
+export function serviceAccent(service: ServiceIconInput): string {
+  return serviceIcon(service)?.color ?? serviceTypeColor(service.type ?? 'service');
+}