feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

app/models/domain.go

@@ -0,0 +1,32 @@
+package models
+
+import (
+	"rsgit.ru/rsmon/rsmon/app/models/concerns"
+)
+
+// Domain represents a customer-facing DNS name. The shape mirrors
+// rstuff's `domains` table — see docs/parity/rstuff-inventory.md §2
+// and docs/plans/inventory-management.md §4.
+//
+// Distinct from RknDomain (the RKN blocklist cache, see
+// app/models/rkn_domain.go): RknDomain is read-only data about
+// blocked domains; Domain is the customer-side name→site/server
+// pointer that monitoring reasons about.
+type Domain struct {
+	concerns.Model
+
+	AccountID int64    `gorm:"type:bigint REFERENCES accounts(id);not null;index" json:"account_id"`
+	Account   *Account `json:"-"`
+	ServerID  *int64   `gorm:"type:bigint REFERENCES servers(id) ON DELETE SET NULL;index" json:"server_id,omitempty"`
+	Server    *Server  `json:"-"`
+	SiteID    *int64   `gorm:"type:bigint REFERENCES sites(id) ON DELETE SET NULL;index" json:"site_id,omitempty"`
+	Site      *Site    `json:"site,omitempty"`
+	Name      string   `gorm:"size:255;not null" json:"name"`
+	Env       string   `gorm:"size:32;not null;default:'production'" json:"env"`
+	IsActive  bool     `gorm:"not null;default:true" json:"is_active"`
+
+	concerns.Timestamped
+}
+
+// TableName provides functionality.
+func (Domain) TableName() string { return "domains" }