feat(proxmox): add go-proxmox submodule for customized Proxmox integration

Add the go-proxmox library as a Git submodule to enable Proxmox
integration for container/VM management.

Submodule: https://github.com/yusing/go-proxmox

.gitmodules

@@ -7,3 +7,6 @@
 [submodule "goutils"]
 	path = goutils
 	url = https://github.com/yusing/goutils.git
+[submodule "internal/go-proxmox"]
+	path = internal/go-proxmox
+	url = https://github.com/yusing/go-proxmox

go.mod

@@ -4,6 +4,7 @@ go 1.25.6
 
 replace (
 	github.com/coreos/go-oidc/v3 => ./internal/go-oidc
+	github.com/luthermonson/go-proxmox => ./internal/go-proxmox
 	github.com/shirou/gopsutil/v4 => ./internal/gopsutil
 	github.com/yusing/godoxy/agent => ./agent
 	github.com/yusing/godoxy/internal/dnsproviders => ./internal/dnsproviders

go.sum

@@ -205,8 +205,6 @@ github.com/lithammer/fuzzysearch v1.1.8 h1:/HIuJnjHuXS8bKaiTMeeDlW2/AyIWk2brx1V8
 github.com/lithammer/fuzzysearch v1.1.8/go.mod h1:IdqeyBClc3FFqSzYq/MXESsS4S0FsZ5ajtkr5xPLts4=
 github.com/lufia/plan9stats v0.0.0-20251013123823-9fd1530e3ec3 h1:PwQumkgq4/acIiZhtifTV5OUqqiP82UAl0h87xj/l9k=
 github.com/lufia/plan9stats v0.0.0-20251013123823-9fd1530e3ec3/go.mod h1:autxFIvghDt3jPTLoqZ9OZ7s9qTGNAWmYCjVFWPX/zg=
-github.com/luthermonson/go-proxmox v0.3.2 h1:/zUg6FCl9cAABx0xU3OIgtDtClY0gVXxOCsrceDNylc=
-github.com/luthermonson/go-proxmox v0.3.2/go.mod h1:oyFgg2WwTEIF0rP6ppjiixOHa5ebK1p8OaRiFhvICBQ=
 github.com/magefile/mage v1.15.0 h1:BvGheCMAsG3bWUDbZ8AyXXpCNwU9u5CB6sM+HNb9HYg=
 github.com/magefile/mage v1.15.0/go.mod h1:z5UZb/iS3GoOSn0JgWuiw7dxlurVYTu+/jHXqQg881A=
 github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=