refactor: move project under backend

backend/x402/facilitator/networks.json

@@ -0,0 +1,21 @@
+{
+  "evm": {
+    "ethereum": {
+      "chainId": 1,
+      "rpcEnv": "ETHEREUM_RPC_URL",
+      "explorer": "https://etherscan.io/tx/"
+    },
+    "bsc": {
+      "chainId": 56,
+      "rpcEnv": "BSC_RPC_URL",
+      "explorer": "https://bscscan.com/tx/"
+    }
+  },
+  "svm": {
+    "solana": {
+      "cluster": "mainnet-beta",
+      "rpcEnv": "SOLANA_RPC_URL",
+      "explorer": "https://solscan.io/tx/"
+    }
+  }
+}