feat(networking): Deploy newt agent as a Nomad service

Introduces a new Nomad job definition (`newt.nomad`) to deploy the `newt` agent as a managed service within the Homelab environment.

This job configures a single `newt-agent` task using the `fosrl/newt:latest` Podman image. The agent is set up with specific environment variables for endpoint, ID, and secret, enabling it to connect to the Pangolin service and establish network connectivity. Resource limits for CPU and memory are also defined.

stacks/networking/newt.nomad

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+job "networking" {
+  datacenters = ["Homelab-PTECH-DC"]
+  region      = "home"
+  type        = "service"
+
+  update {
+    max_parallel      = 1
+    min_healthy_time  = "10s"
+    healthy_deadline  = "3m"
+    progress_deadline = "10m"
+    auto_revert       = true
+  }
+
+  group "newt" {
+    count = 1
+
+    network {
+      mode = "bridge"
+      dns {
+        servers  = ["192.168.1.133"]
+        searches = ["service.consul"]
+      }
+    }
+
+    restart {
+      interval = "5m"
+      attempts = 3
+      delay    = "15s"
+      mode     = "fail"
+    }
+
+    reschedule {
+      delay          = "30s"
+      delay_function = "exponential"
+      max_delay      = "1h"
+      unlimited      = true
+    }
+
+    task "newt-agent" {
+      driver = "podman"
+
+      config {
+        image = "docker.io/fosrl/newt:latest"
+      }
+
+      env {
+        PANGOLIN_ENDPOINT = "https://proxy.prestonhunter.space"
+        NEWT_ID           = "jr0r2x7cujxkipq"
+        NEWT_SECRET       = "agj92hbufuoehq8etfbndgt9htkigkr3vnh0imq82xaz591b"
+      }
+
+      resources {
+        cpu    = 200
+        memory = 256
+      }
+    }
+  }
+}