feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

app/models/server_ip.go

@@ -0,0 +1,36 @@
+package models
+
+import (
+	"rsgit.ru/rsmon/rsmon/app/models/concerns"
+)
+
+// ServerIp is a single IP (v4 or v6) bound to a Server. The
+// canonical source for these rows is the deploymentd server-inventory
+// receiver (M1) and the network-diagnostics partial plan; today the
+// only writer is operator-entered via /api/v1/servers/:id/ips.
+//
+// `address` is Postgres `inet` so range queries (`<<` / `>>`) work
+// without parsing text. One row per (server_id, address). The
+// `is_primary` flag is set when more than one IP exists and the
+// deploymentd payload signals a primary; otherwise the first row wins.
+//
+//nolint:revive // ServerIP rename deferred to M3; rstuff schema uses ServerIp verbatim and parity test depends on it.
+type ServerIp struct {
+	concerns.Model
+
+	ServerID int64   `gorm:"type:bigint REFERENCES servers(id) ON DELETE CASCADE;not null;index" json:"server_id"`
+	Server   *Server `json:"-"`
+	// Address is mapped to Postgres inet via raw SQL in Migrate(); the
+	// GORM `type:` tag is not enough because gorm.io/driver/postgres
+	// does not register `inet` in its type map. Field is stored as a
+	// string and validated by the API layer (see
+	// app/controllers/api/server.go ServerIPsAdd).
+	Address           string `gorm:"type:inet;not null" json:"address"`
+	IsPrimary         bool   `gorm:"not null;default:false" json:"is_primary"`
+	RelatedSitesCount int    `gorm:"not null;default:0" json:"related_sites_count"`
+
+	concerns.Timestamped
+}
+
+// TableName provides functionality.
+func (ServerIp) TableName() string { return "server_ips" }