fix: complete Pezkuwi overlay + proper Nova merge

Pezkuwi overlay (B source):
- pezkuwi-chains.json: 4 chains (Relay, Zagros, Asset Hub, People)
- pezkuwi-xcm.json: full XCM config with networkDeliveryFee, networkBaseWeight
- pezkuwi-xcm-dynamic.json: dynamic XCM config

Merge script:
- Takes Nova as base (A source)
- Adds Pezkuwi entries to ALL XCM sections
- Pezkuwi chains appear first
- Nothing gets deleted

All chains have disabledCheckMetadataHash: true

chains/v18/chains_dev.json

@@ -56,7 +56,42 @@
     "additional": {
       "themeColor": "#009639",
       "defaultBlockTimeMillis": 6000,
-      "feeViaRuntimeCall": true
+      "feeViaRuntimeCall": true,
+      "disabledCheckMetadataHash": true
+    }
+  },
+  {
+    "chainId": "96eb58af1bb7288115b5e4ff1590422533e749293f231974536dc6672417d06f",
+    "name": "Zagros Testnet",
+    "icon": "https://raw.githubusercontent.com/pezkuwichain/pezkuwi-wallet-utils/main/icons/chains/Pezkuwi.png",
+    "addressPrefix": 42,
+    "options": [
+      "testnet"
+    ],
+    "nodes": [
+      {
+        "url": "wss://zagros-rpc.pezkuwichain.io",
+        "name": "Zagros Node"
+      }
+    ],
+    "assets": [
+      {
+        "assetId": 0,
+        "symbol": "HEZ",
+        "precision": 12,
+        "name": "Hezkurd",
+        "priceId": "hezkurd",
+        "staking": [
+          "relaychain"
+        ],
+        "type": "native",
+        "icon": "https://raw.githubusercontent.com/pezkuwichain/pezkuwi-wallet-utils/main/icons/tokens/HEZ.png"
+      }
+    ],
+    "additional": {
+      "themeColor": "#009639",
+      "feeViaRuntimeCall": true,
+      "disabledCheckMetadataHash": true
     }
   },
   {