feat(proxmox): better node-level routes auto-discovery with pointer VMID

- Add BaseURL field to Client for node-level route configuration
- Change VMID from int to *int to support three states:
  - nil: auto-discover node or VM from hostname/IP/alias
  - 0: node-level route (direct to Proxmox node API)
  - >0: LXC/QEMU resource route with container control
- Change Service string to Services []string for multi-service support
- Implement proper node-level route handling: HTTPS scheme,
  hostname from node BaseURL, default port 8006
- Move initial UpdateResources call to Init before starting loop
- Move proxmox auto-discovery earlier in route validation

BREAKING: NodeConfig.VMID is now a pointer type; NodeConfig.Service
renamed to Services (backward compatible via alias)

internal/proxmox/client.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"net"
+	"net/url"
 	"runtime"
 	"slices"
 	"strconv"
@@ -21,6 +22,7 @@ type Client struct {
 	*proxmox.Client
 	*proxmox.Cluster
 	Version *proxmox.Version
+	BaseURL *url.URL
 	// id -> resource; id: lxc/<vmid> or qemu/<vmid>
 	resources   map[string]*VMResource
 	resourcesMu sync.RWMutex
@@ -44,6 +46,11 @@ func NewClient(baseUrl string, opts ...proxmox.Option) *Client {
 }
 
 func (c *Client) UpdateClusterInfo(ctx context.Context) (err error) {
+	baseURL, err := url.Parse(c.Client.GetBaseURL())
+	if err != nil {
+		return err
+	}
+	c.BaseURL = baseURL
 	c.Version, err = c.Client.Version(ctx)
 	if err != nil {
 		return err

internal/proxmox/config.go

@@ -96,6 +96,15 @@ func (c *Config) Init(ctx context.Context) gperr.Error {
 		return gperr.New("failed to fetch proxmox cluster info").With(err)
 	}
 
+	{
+		reqCtx, reqCtxCancel := context.WithTimeout(ctx, ResourcePollInterval)
+		err := c.client.UpdateResources(reqCtx)
+		reqCtxCancel()
+		if err != nil {
+			log.Warn().Err(err).Str("cluster", c.client.Cluster.Name).Msg("[proxmox] failed to update resources")
+		}
+	}
+
 	go c.updateResourcesLoop(ctx)
 	return nil
 }
@@ -106,15 +115,6 @@ func (c *Config) updateResourcesLoop(ctx context.Context) {
 
 	log.Trace().Str("cluster", c.client.Cluster.Name).Msg("[proxmox] starting resources update loop")
 
-	{
-		reqCtx, reqCtxCancel := context.WithTimeout(ctx, ResourcePollInterval)
-		err := c.client.UpdateResources(reqCtx)
-		reqCtxCancel()
-		if err != nil {
-			log.Warn().Err(err).Str("cluster", c.client.Cluster.Name).Msg("[proxmox] failed to update resources")
-		}
-	}
-
 	for {
 		select {
 		case <-ctx.Done():

internal/proxmox/node.go

@@ -10,10 +10,10 @@ import (
 )
 
 type NodeConfig struct {
-	Node    string `json:"node" validate:"required"`
-	VMID    int    `json:"vmid" validate:"required"`
-	VMName  string `json:"vmname,omitempty"`
-	Service string `json:"service,omitempty"`
+	Node     string   `json:"node"`
+	VMID     *int     `json:"vmid"` // unset: auto discover; explicit 0: node-level route; >0: lxc/qemu resource route
+	VMName   string   `json:"vmname,omitempty"`
+	Services []string `json:"services,omitempty" aliases:"service"`
 } // @name ProxmoxNodeConfig
 
 type Node struct {