Keep ai Flatcar memory at 4G

Do not bump RAM for the OpenCode addition.

Co-authored-by: Nick Trochalakis <[email protected]>

terraform.tfvars

@@ -218,8 +218,7 @@ nodes = {
         vmid             = 211
         ip               = "192.168.7.61"
         vlan             = 7
-        # 8G: LiteLLM + Open WebUI + Qdrant + open-terminal + OpenCode.
+        memory           = 4096
-        memory           = 8192
         cores            = 2
         disk_size        = 32
         qemu_guest_agent = false