chore: stop tracking terraform.tfvars (contains API token); add .gitignore

terraform.tfvars holds the Proxmox root@pam API token and was committed since the
initial commit. Remove it from tracking and ignore *.tfvars (keeping
*.tfvars.example). NOTE: the token is still in git history on origin
(git.gihyeon.com) — rotate it in Proxmox to fully remediate.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,3 @@
+# Terraform secrets — never commit. Use terraform.tfvars.example as the template.
+*.tfvars
+!*.tfvars.example

terraform.tfvars

@@ -1,14 +0,0 @@
-# Proxmox 연결 정보
-proxmox_endpoint  = "https://192.168.50.87:8006"
-proxmox_api_token = "root@pam!terrform=1408ded5-c7c4-4384-8b19-64178837fb8c"
-
-# PBS 네트워크 설정
-pbs_network_bridge = "intra01" # TODO: SDN VNET 브릿지 이름으로 변경
-pbs_ip_address     = "10.1.20.11/24"
-pbs_gateway        = "10.1.20.254" # TODO: SDN 게이트웨이 확인
-dns_servers        = ["1.1.1.1", "8.8.8.8"]
-
-# Hermes Agent LXC 설정 (node1 / intra01)
-hermes_vmid           = 118
-hermes_node           = "gihyeon"
-hermes_network_bridge = "intra01"