feat(templates): catalog v2 — 5 new managed-DB stacks + seed validation test

Ghost+MySQL, Gitea+PostgreSQL, Nextcloud+PG+Redis, Paperless+PG+Redis,
Plausible+PG+ClickHouse. TestOfficialTemplatesAllParse parses every
seed, topo-sorts graphs, and dry-resolves with no unresolved refs.

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

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

app/backend/internal/api/templategraph_test.go

@@ -1,6 +1,7 @@
 package api
 
 import (
+	"encoding/json"
 	"strings"
 	"testing"
 )
@@ -157,3 +158,45 @@ func TestValidateTemplateGraph(t *testing.T) {
 		t.Fatal("expected missing runtime error")
 	}
 }
+
+// TestOfficialTemplatesAllParse walks every seeded template and asserts the
+// config parses, graph templates topo-sort + validate, and a dry-run resolve
+// produces no unresolved refs (defaults cover all expressions).
+func TestOfficialTemplatesAllParse(t *testing.T) {
+	for _, tpl := range SeedTemplates() {
+		var cfg TemplateConfig
+		if err := json.Unmarshal([]byte(tpl.Config), &cfg); err != nil {
+			t.Errorf("%s: config parse: %v", tpl.ID, err)
+			continue
+		}
+		if len(cfg.Services) == 0 {
+			continue
+		}
+		sorted, err := topoSortServices(cfg.Services)
+		if err != nil {
+			t.Errorf("%s: topo sort: %v", tpl.ID, err)
+			continue
+		}
+		if err := validateTemplateGraph(sorted); err != nil {
+			t.Errorf("%s: validate: %v", tpl.ID, err)
+			continue
+		}
+		var vars []TemplateVariable
+		if tpl.Variables != "" {
+			if err := json.Unmarshal([]byte(tpl.Variables), &vars); err != nil {
+				t.Errorf("%s: variables parse: %v", tpl.ID, err)
+				continue
+			}
+		}
+		userVars := map[string]string{}
+		for _, v := range vars {
+			if v.Default != "" {
+				userVars[v.Key] = v.Default
+			}
+		}
+		graph := resolveTemplateGraph(sorted, userVars)
+		if len(graph.unresolved) > 0 {
+			t.Errorf("%s: unresolved refs: %v", tpl.ID, graph.unresolved)
+		}
+	}
+}

app/backend/internal/api/templates.go

@@ -1006,6 +1006,74 @@ func SeedTemplates() []ServiceTemplate {
 			Variables:  `[]`,
 			IsOfficial: true,
 		},
+		{
+			ID:          "tpl-ghost-stack",
+			Name:        "Ghost + MySQL",
+			Description: "Ghost publishing platform backed by a managed MySQL database",
+			Category:    "stack",
+			Logo:        "https://cdn.simpleicons.org/ghost",
+			Config: `{"version":2,"services":[
+				{"key":"db","type":"database","runtime":"mysql","environment":{"MYSQL_DATABASE":"ghost"}},
+				{"key":"web","name":"ghost","type":"web","runtime":"ghost:5-alpine","port":2368,"depends_on":["db"],
+				 "environment":{"url":"{{APP_URL:-http://localhost:2368}}","database__client":"mysql","database__connection__host":"{{service.db.host}}","database__connection__user":"{{service.db.user}}","database__connection__password":"{{service.db.password}}","database__connection__database":"{{service.db.database}}"}}]}`,
+			Variables:  `[{"key":"APP_URL","label":"Public URL","default":"","required":false,"secret":false}]`,
+			IsOfficial: true,
+		},
+		{
+			ID:          "tpl-gitea-stack",
+			Name:        "Gitea + PostgreSQL",
+			Description: "Self-hosted Git service backed by a managed PostgreSQL database",
+			Category:    "stack",
+			Logo:        "https://cdn.simpleicons.org/gitea",
+			Config: `{"version":2,"services":[
+				{"key":"db","type":"database","runtime":"postgresql","environment":{"POSTGRES_DB":"gitea"}},
+				{"key":"web","name":"gitea","type":"web","runtime":"gitea/gitea:1","port":3000,"health_check":"/api/healthz","depends_on":["db"],
+				 "environment":{"GITEA__database__DB_TYPE":"postgres","GITEA__database__HOST":"{{service.db.host}}:{{service.db.port}}","GITEA__database__NAME":"{{service.db.database}}","GITEA__database__USER":"{{service.db.user}}","GITEA__database__PASSWD":"{{service.db.password}}","GITEA__security__SECRET_KEY":"{{secret}}","GITEA__security__INTERNAL_TOKEN":"{{secret(64)}}"}}]}`,
+			Variables:  `[]`,
+			IsOfficial: true,
+		},
+		{
+			ID:          "tpl-nextcloud-stack",
+			Name:        "Nextcloud + PostgreSQL + Redis",
+			Description: "Nextcloud with a managed PostgreSQL database and Redis cache",
+			Category:    "stack",
+			Logo:        "https://cdn.simpleicons.org/nextcloud",
+			Config: `{"version":2,"services":[
+				{"key":"db","type":"database","runtime":"postgresql","environment":{"POSTGRES_DB":"nextcloud"}},
+				{"key":"cache","type":"database","runtime":"redis"},
+				{"key":"web","name":"nextcloud","type":"web","runtime":"nextcloud:30-apache","port":80,"health_check":"/status.php","depends_on":["db","cache"],
+				 "environment":{"POSTGRES_HOST":"{{service.db.host}}","POSTGRES_DB":"{{service.db.database}}","POSTGRES_USER":"{{service.db.user}}","POSTGRES_PASSWORD":"{{service.db.password}}","REDIS_HOST":"{{service.cache.host}}","REDIS_HOST_PASSWORD":"{{service.cache.password}}","NEXTCLOUD_ADMIN_USER":"admin","NEXTCLOUD_ADMIN_PASSWORD":"{{secret}}","NEXTCLOUD_TRUSTED_DOMAINS":"{{APP_DOMAIN:-localhost}}"}}]}`,
+			Variables:  `[{"key":"APP_DOMAIN","label":"Trusted domain","default":"","required":false,"secret":false}]`,
+			IsOfficial: true,
+		},
+		{
+			ID:          "tpl-paperless-stack",
+			Name:        "Paperless-ngx + PostgreSQL + Redis",
+			Description: "Document management with managed PostgreSQL and Redis",
+			Category:    "stack",
+			Logo:        "https://cdn.simpleicons.org/paperlessngx",
+			Config: `{"version":2,"services":[
+				{"key":"db","type":"database","runtime":"postgresql","environment":{"POSTGRES_DB":"paperless"}},
+				{"key":"cache","type":"database","runtime":"redis"},
+				{"key":"web","name":"paperless","type":"web","runtime":"ghcr.io/paperless-ngx/paperless-ngx:latest","port":8000,"depends_on":["db","cache"],
+				 "environment":{"PAPERLESS_DBHOST":"{{service.db.host}}","PAPERLESS_DBPORT":"{{service.db.port}}","PAPERLESS_DBNAME":"{{service.db.database}}","PAPERLESS_DBUSER":"{{service.db.user}}","PAPERLESS_DBPASS":"{{service.db.password}}","PAPERLESS_REDIS":"{{service.cache.url}}","PAPERLESS_ADMIN_USER":"admin","PAPERLESS_ADMIN_PASSWORD":"{{secret}}","PAPERLESS_SECRET_KEY":"{{secret(48)}}","PAPERLESS_URL":"{{APP_URL:-http://localhost:8000}}"}}]}`,
+			Variables:  `[{"key":"APP_URL","label":"Public URL","default":"","required":false,"secret":false}]`,
+			IsOfficial: true,
+		},
+		{
+			ID:          "tpl-plausible-stack",
+			Name:        "Plausible + PostgreSQL + ClickHouse",
+			Description: "Privacy-friendly analytics with managed PostgreSQL and ClickHouse",
+			Category:    "stack",
+			Logo:        "https://cdn.simpleicons.org/plausibleanalytics",
+			Config: `{"version":2,"services":[
+				{"key":"db","type":"database","runtime":"postgresql","environment":{"POSTGRES_DB":"plausible"}},
+				{"key":"events","type":"database","runtime":"clickhouse","environment":{"CLICKHOUSE_DB":"plausible"}},
+				{"key":"web","name":"plausible","type":"web","runtime":"ghcr.io/plausible/community-edition:v2","port":8000,"health_check":"/api/health","depends_on":["db","events"],
+				 "environment":{"BASE_URL":"{{APP_URL:-http://localhost:8000}}","SECRET_KEY_BASE":"{{secret(64)}}","DATABASE_URL":"{{service.db.url}}","CLICKHOUSE_DATABASE_URL":"http://{{service.events.host}}:{{service.events.port}}/{{service.events.database}}","TOTP_VAULT_KEY":"{{secret(32)}}"}}]}`,
+			Variables:  `[{"key":"APP_URL","label":"Public URL","default":"","required":false,"secret":false}]`,
+			IsOfficial: true,
+		},
 	}
 	return templates
 }