refactor(proxmox): consolidate NodeConfig and add service field

Centralize Proxmox node configuration by moving `ProxmoxConfig` from `internal/types/idlewatcher.go` to a new `NodeConfig` struct in `internal/proxmox/node.go`.

- Add `proxmox` field to route; allowing `proxy.app.proxmox` labels and corresponding route file config
- Added `service` optional field to NodeConfig for service identification
- Integrated Proxmox config directly into Route struct with proper validation
- Propagate Proxmox settings to Idlewatcher during route validation
- Updated swagger documentation to reflect schema changes

internal/route/route.go

@@ -64,6 +64,8 @@ type (
 		AccessLog    *accesslog.RequestLoggerConfig `json:"access_log,omitempty" extensions:"x-nullable"`
 		Agent        string                         `json:"agent,omitempty"`
 
+		Proxmox *proxmox.NodeConfig `json:"proxmox,omitempty" extensions:"x-nullable"`
+
 		Idlewatcher *types.IdlewatcherConfig `json:"idlewatcher,omitempty" extensions:"x-nullable"`
 
 		Metadata `deserialize:"-"`
@@ -176,6 +178,10 @@ func (r *Route) validate() gperr.Error {
 		}
 	}, r.started)
 
+	if r.Proxmox != nil && r.Idlewatcher != nil {
+		r.Idlewatcher.Proxmox = r.Proxmox
+	}
+
 	if r.Idlewatcher != nil && r.Idlewatcher.Proxmox != nil {
 		node := r.Idlewatcher.Proxmox.Node
 		vmid := r.Idlewatcher.Proxmox.VMID