feat(proxmox): enhance VM resource tracking with auto-discovery and cached IPs

- Add VMResource wrapper type with cached IP addresses for efficient lookups
- Implement concurrent IP fetching during resource updates (limited concurrency)
- Add ReverseLookupResource for discovering VMs by IP, hostname, or alias
- Prioritize interfaces API over config for IP retrieval (offline container fallback)
- Enable routes to auto-discover Proxmox resources when no explicit config provided
- Fix configuration type from value to pointer slice for correct proxmox client retrievel
- Ensure Proxmox providers are initialized before route validation

internal/api/v1/docs/swagger.json

@@ -4458,6 +4458,9 @@
           "type": "integer",
           "x-nullable": false,
           "x-omitempty": false
+        },
+        "vmname": {
+          "type": "string"
         }
       },
       "x-nullable": false,

internal/api/v1/docs/swagger.yaml

@@ -941,6 +941,8 @@ definitions:
         type: string
       vmid:
         type: integer
+      vmname:
+        type: string
     required:
     - node
     - vmid