chore: add Windows agent source baseline

agents/windows/config.example.json

@@ -0,0 +1,21 @@
+{
+  "hub_url": "https://minerops.example.invalid",
+  "agent_id": "replace-with-agent-id",
+  "site_id": "00000000-0000-0000-0000-000000000000",
+  "site_name": "Example Site",
+  "agent_secret": "replace-with-agent-secret",
+  "poll_interval_seconds": 120,
+  "ip_ranges": [
+    {
+      "name": "Example Range",
+      "cidr": "192.0.2.0/24",
+      "enabled": false,
+      "api_port": 4028,
+      "api3_port": 4433
+    }
+  ],
+  "api3_account": "replace-with-api3-account",
+  "api3_password": "replace-with-api3-password",
+  "api3_port": 4433
+}
+