refactor: rename error classes for consistency and clarity; update related code and tests

examples/client_init.py

@@ -0,0 +1,36 @@
+"""
+Example: initializing FragmentClient.
+
+Cookies can be passed as a dict or as a JSON string.
+wallet_version defaults to "V5R1" — change to "V4R2" for older wallets.
+"""
+
+import asyncio
+
+from fragmentapi import FragmentClient
+
+SEED = "word1 word2 word3 word4 word5 word6 word7 word8 word9 word10 word11 word12 word13 word14 word15 word16 word17 word18 word19 word20 word21 word22 word23 word24"
+API_KEY = "YOUR_TONAPI_KEY"
+COOKIES = {
+    "stel_ssid": "YOUR_STEL_SSID",
+    "stel_dt": "YOUR_STEL_DT",
+    "stel_token": "YOUR_STEL_TOKEN",
+    "stel_ton_token": "YOUR_STEL_TON_TOKEN",
+}
+
+
+async def main() -> None:
+    client = FragmentClient(
+        seed=SEED,
+        api_key=API_KEY,
+        cookies=COOKIES,
+        wallet_version="V5R1",  # or "V4R2"
+    )
+
+    print("FragmentClient initialized")
+    print("   %-16s %s" % ("Wallet version:", client.wallet_version))
+    print("   %-16s %s..." % ("API key:", client.api_key[:8]))
+
+
+if __name__ == "__main__":
+    asyncio.run(main())