fix: Read Tycho Router addresses from file

--- don't change below this line ---
ENG-4675 Took 17 minutes

foundry/scripts/deploy-uniswap-x-filler.js

@@ -1,28 +1,29 @@
 require('dotenv').config();
 const {ethers} = require("hardhat");
 const hre = require("hardhat");
+const path = require("path");
+const fs = require("fs");
 
 async function main() {
     const network = hre.network.name;
-    let tychoRouter;
     let uniswapXReactor;
     let nativeToken;
     if (network === "ethereum") {
-        tychoRouter = "0xfD0b31d2E955fA55e3fa641Fe90e08b677188d35";
         uniswapXReactor = "0x00000011F84B9aa48e5f8aA8B9897600006289Be";
         nativeToken = "0x0000000000000000000000000000000000000000";
     } else if (network === "base") {
-        tychoRouter = "0xea3207778e39EB02D72C9D3c4Eac7E224ac5d369";
         uniswapXReactor = "0x000000001Ec5656dcdB24D90DFa42742738De729";
         nativeToken = "0x0000000000000000000000000000000000000000";
     } else if (network === "unichain") {
-        tychoRouter = "0xFfA5ec2e444e4285108e4a17b82dA495c178427B";
         uniswapXReactor = "0x00000006021a6Bce796be7ba509BBBA71e956e37";
         nativeToken = "0x0000000000000000000000000000000000000000";
     } else {
         throw new Error(`Unsupported network: ${network}`);
     }
 
+    const routerAddressesFilePath = path.join(__dirname, "../../config/router_addresses.json");
+    const tychoRouter = JSON.parse(fs.readFileSync(routerAddressesFilePath, "utf8"))[network];
+
     console.log(`Deploying Uniswap X filler to ${network} with:`);
     console.log(`- Tycho router: ${tychoRouter}`);
     console.log(`- Uniswap X reactor: ${uniswapXReactor}`);