Implement standalone FromChat Protocol

frontend/packages/fromchat-protocol/src/crypto/index.ts

@@ -0,0 +1,7 @@
+// Re-export all crypto functions for convenience
+export { generateX25519KeyPair, ecdhSharedSecret, deriveWrappingKey } from "./asymmetric";
+export type { X25519KeyPair } from "./asymmetric";
+export { importAesGcmKey, aesGcmEncrypt, aesGcmDecrypt } from "./symmetric";
+export type { AesGcmCiphertext } from "./symmetric";
+export { hkdfExtractAndExpand, randomBytes, importPassword, deriveKEK } from "./kdf";
+