feat(demo): seed the default set's NPC profiles, factions and chat titles (DM26)

The restored rig's RunicNPC says it is already managed, so a fresh site
adopts none of its profiles and its first push empties them; chat styles
are never adopted either. They come from the fixture now, through
Module-Rust's onDemoSeed (needs the release carrying DM26; an older module
ignores these keys):

- npcs.factions: bandits and guards, allied;
- npcs.profiles: bandit (roamer, rnpc_raider) and guard (sentry, heavy,
  rnpc_campguard, heals), both on the demo server. Only the fields that
  differ from RunicNPC's defaults are listed;
- chat: [VIP] in gold and [MOD] in green.

The baseline's placements (bandit-1, bandit-2, guard-1) spawn again once
the site pushes these.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

deploy/demo/seed.json

@@ -118,6 +118,40 @@
       ],
       "links": [
         { "username": "demo-player", "steamId": "$env:DEMO_PLAYER_STEAM_ID", "serverId": "demo" }
+      ],
+      "npcs": {
+        "factions": [{ "a": "bandits", "b": "guards", "relation": "allied" }],
+        "profiles": [
+          {
+            "name": "bandit",
+            "servers": ["demo"],
+            "body": {
+              "kits": ["rnpc_raider"],
+              "names": ["Bandit", "Bandit Scout"],
+              "role": "roamer",
+              "movement": { "mode": "wander", "radius": 20 },
+              "health": 150,
+              "faction": "bandits"
+            }
+          },
+          {
+            "name": "guard",
+            "servers": ["demo"],
+            "body": {
+              "kits": ["rnpc_campguard"],
+              "names": ["Camp Guard"],
+              "prefab": "scientistnpc_heavy",
+              "role": "sentry",
+              "health": 300,
+              "faction": "guards",
+              "kitUse": { "heal": true, "grenades": false, "melee": false, "rockets": false, "flamethrower": false }
+            }
+          }
+        ]
+      },
+      "chat": [
+        { "serverId": "demo", "group": "vip", "style": { "Title": "[VIP]", "TitleColor": "#ffaa00", "UsernameColor": "#ffaa00", "Priority": "10" } },
+        { "serverId": "demo", "group": "moderator", "style": { "Title": "[MOD]", "TitleColor": "#55ff55", "UsernameColor": "#55ff55", "Priority": "50" } }
       ]
     }
   }