Refactor tonapi module: Move account and transaction logic to services

- Moved account-related functions and classes from `pyfragment.domains.tonapi.account` to `pyfragment.services.tonapi.account`.
- Moved transaction-related functions and classes from `pyfragment.domains.tonapi.transaction` to `pyfragment.services.tonapi.transaction`.
- Updated imports across the codebase to reflect the new structure.
- Removed unused `tonapi` module files and cleaned up related code.
- Introduced `ApiProvider` enum to manage API provider types.
- Added validation functions for cookies and wallet versions in a new `validation.py` module.

pyfragment/services/tonapi/models.py

@@ -0,0 +1,17 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+
+@dataclass
+class WalletInfo:
+    address: str
+    state: str
+    gram_balance: float
+    usdt_balance: float
+
+    def __repr__(self) -> str:
+        return (
+            f"WalletInfo(address='{self.address}', state='{self.state}', "
+            f"gram_balance={self.gram_balance} GRAM (ex TON), usdt_balance={self.usdt_balance} USDT)"
+        )