v0.77.0: per-app open_path for the Megnyitás link

Optional .felhom.yml open_path appended to the open-app URL in dashboard/deploy/app-info
(via .Meta.OpenPath). Empty=bare root. Fixes apps whose UI isn't at / (gokapi /admin, ghost /ghost/).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

controller/internal/stacks/metadata.go

@@ -16,6 +16,9 @@ type Metadata struct {
 	Category       string                `yaml:"category" json:"category"`
 	Subdomain      string                `yaml:"subdomain" json:"subdomain"`
 	Slug           string                `yaml:"slug" json:"slug"`
+	// OpenPath is appended to the app's public URL for the "Megnyitás" (open) link, for apps whose UI
+	// isn't at "/" (e.g. Gokapi → "/admin"). Empty = bare root. Must start with "/".
+	OpenPath       string                `yaml:"open_path,omitempty" json:"open_path,omitempty"`
 	Resources      ResourceHints         `yaml:"resources" json:"resources"`
 	DeployFields   []DeployField         `yaml:"deploy_fields" json:"deploy_fields"`
 	AppInfo        AppInfo               `yaml:"app_info" json:"app_info"`