feat(fls): write the system software of a .fls, loaded by Java as the original

topologyWriter.ts now sets the system software each device's constructor
makes, through its setters: a switch's SSID and learning time, a host's
SSID, RIP, manual routes, DHCP client and server with static assignments,
static NAT, the modem, and a router's or home router's firewall. The
firewall is reached as XMLEncoder reaches it, through the web server's
`konfig` plug-in: the constructor hangs the same object there and among
the applications, where its key differs (Firewall on a router, NatGateway
on a home router). A switch's SSID the file lacked stays unwritten, so Java
rolls one as it did. Files and applications are later layers.

javaBeansWriter.ts: a call can carry statements on its result (a map's
value changed through get(key)), checked by Java's XMLDecoder in a new
case; a short() helper for Java's short values.

Checked by Java against Java: every corpus file, read and written again,
loads with the same system software (without files and applications) as
the original. The synthetic topology adds what the corpus lacks: a router
firewall switched on with rules of every protocol (one with a null
address), every flag away from its default, a modem with its own port and
target, and a PC's SSID, routes and DHCP server. 16 mutation probes, each
rewritten and loaded by Java, were all caught.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/fls/test/beans/beans.java.json

@@ -316,7 +316,7 @@
                 "string": "10.0.0.1"
               },
               "mac": {
-                "string": "8E:A8:7E:96:38:62"
+                "string": "EE:8A:4E:46:17:34"
               },
               "port": {
                 "id": 2,
@@ -337,6 +337,34 @@
     ],
     "errors": []
   },
+  "results.xml": {
+    "values": [
+      {
+        "id": 0,
+        "class": "java.util.HashMap",
+        "entries": [
+          [
+            {
+              "string": "key"
+            },
+            {
+              "id": 1,
+              "class": "java.util.ArrayList",
+              "items": [
+                {
+                  "string": "first"
+                },
+                {
+                  "string": "second"
+                }
+              ]
+            }
+          ]
+        ]
+      }
+    ],
+    "errors": []
+  },
   "shared.xml": {
     "values": [
       {