Add full Chain 138 integration: 8 steps, chain spec, app-ethereum config, docs

Co-authored-by: Cursor <cursoragent@cursor.com>

chains/eip155-138.json

@@ -0,0 +1,49 @@
+{
+  "name": "Defi Oracle Meta Mainnet",
+  "chain": "dfiometa",
+  "icon": "defioraclemeta",
+  "rpc": [
+    "https://rpc-http-pub.d-bis.org",
+    "wss://rpc-ws-pub.d-bis.org",
+    "https://rpc.d-bis.org",
+    "wss://rpc.d-bis.org",
+    "https://rpc2.d-bis.org",
+    "wss://ws.rpc.d-bis.org",
+    "wss://ws.rpc2.d-bis.org",
+    "https://rpc.public-0138.defi-oracle.io",
+    "wss://rpc.public-0138.defi-oracle.io",
+    "https://rpc.defi-oracle.io",
+    "wss://wss.defi-oracle.io",
+    "https://defi-oracle-meta.rpc.thirdweb.com/${THIRDWEB_API_KEY}",
+    "https://138.rpc.thirdweb.com/${THIRDWEB_API_KEY}"
+  ],
+  "features": [
+    {
+      "name": "EIP155"
+    },
+    {
+      "name": "EIP1559"
+    }
+  ],
+  "faucets": [],
+  "nativeCurrency": {
+    "name": "Ether",
+    "symbol": "ETH",
+    "decimals": 18
+  },
+  "infoURL": "https://d-bis.org",
+  "shortName": "dfio-meta-main",
+  "chainId": 138,
+  "networkId": 1,
+  "slip44": 60,
+  "ens": {
+    "registry": "0x57f1887a8BF19b14fC0dF6Fd9B2acc9Af147eA85"
+  },
+  "explorers": [
+    {
+      "name": "Blockscout",
+      "url": "https://explorer.d-bis.org",
+      "standard": "EIP3091"
+    }
+  ]
+}