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/proxmox/node.go

@@ -10,6 +10,12 @@ import (
 	"github.com/yusing/goutils/pool"
 )
 
+type NodeConfig struct {
+	Node    string `json:"node" validate:"required"`
+	VMID    int    `json:"vmid" validate:"required"`
+	Service string `json:"service,omitempty"`
+} // @name ProxmoxNodeConfig
+
 type Node struct {
 	name   string
 	id     string // likely node/<name>