Add Solana mainnet chain config entry (native SOL)

New pezkuwi-overlay chain entry mirroring the Tron/Bitcoin native-coin
config shape: solana:mainnet chainId, public mainnet-beta RPC endpoint,
Solana Explorer links, and a native SOL asset (9 decimals). New brand
icons (gradient chain icon + colored token icon) added alongside.

pezkuwi-overlay/chains/pezkuwi-chains.json

@@ -336,5 +336,48 @@
     "additional": {
       "themeColor": "#F7931A"
     }
+  },
+  {
+    "chainId": "solana:mainnet",
+    "name": "Solana",
+    "icon": "https://raw.githubusercontent.com/pezkuwichain/pezkuwi-wallet-utils/pending/post-fix-release/icons/chains/gradient/Solana.svg",
+    "addressPrefix": 0,
+    "options": [
+      "solanaBased",
+      "noSubstrateRuntime"
+    ],
+    "nodeSelectionStrategy": "roundRobin",
+    "nodes": [
+      {
+        "url": "https://api.mainnet-beta.solana.com",
+        "name": "Solana"
+      }
+    ],
+    "explorers": [
+      {
+        "name": "Solana Explorer",
+        "extrinsic": "https://explorer.solana.com/tx/{value}",
+        "account": "https://explorer.solana.com/address/{value}"
+      }
+    ],
+    "externalApi": {},
+    "assets": [
+      {
+        "assetId": 0,
+        "symbol": "SOL",
+        "precision": 9,
+        "name": "Solana",
+        "priceId": "solana",
+        "staking": null,
+        "type": "solanaNative",
+        "icon": "https://raw.githubusercontent.com/pezkuwichain/pezkuwi-wallet-utils/pending/post-fix-release/icons/tokens/colored/SOL.svg",
+        "buyProviders": {},
+        "sellProviders": {},
+        "typeExtras": null
+      }
+    ],
+    "additional": {
+      "themeColor": "#9945FF"
+    }
   }
 ]