feat: 添加 Lighter 签名桥接和公钥派生脚本，支持新的签名库和环境检测功能

scripts/lighter-public-key.ts

@@ -0,0 +1,21 @@
+import "dotenv/config";
+import { LighterPrivateKey } from "../src/exchanges/lighter/crypto/schnorr";
+import { bytesToHex } from "../src/exchanges/lighter/bytes";
+
+function main(): void {
+  const raw = process.env.LIGHTER_API_PRIVATE_KEY;
+  if (!raw) {
+    throw new Error("LIGHTER_API_PRIVATE_KEY env var is required");
+  }
+  const normalized = raw.startsWith("0x") ? raw.slice(2) : raw;
+  const key = LighterPrivateKey.fromHex(normalized);
+  const publicKeyHex = bytesToHex(key.publicKey().toBytes());
+  const apiKeyIndex = process.env.LIGHTER_API_KEY_INDEX ?? "(not set)";
+
+  console.log(JSON.stringify({
+    apiKeyIndex,
+    publicKeyHex,
+  }, null, 2));
+}
+
+main();