fix: default bare 64-hex account hashes to Basechain (0:) in detect_address

[rylaix]

Summary

Fixes an issue where detect_address unconditionally defaults bare 64-character hexadecimal account hashes to Masterchain (-1:) instead of Basechain (0:).

Problem

When a caller supplies a 64-character raw hex string (256-bit account ID) without a workchain prefix, detect_address prepended "-1:". Since the vast majority of user accounts, Jettons, and smart contracts reside on Basechain (0:), this caused downstream API callers and SDK consumers to resolve data from Masterchain for an intended Basechain account without any warning.

Solution

• Updated detect_address in pytonlib/utils/address.py to default bare hexadecimal hashes to "0:".
• Preserves explicit "-1:<hash>" and "0:<hash>" address formats.
• Preserves all friendly address resolution paths.

Reproduction / Test

from pytonlib.utils.address import detect_address

def test_bare_256_bit_hash_defaults_to_basechain():
    account_id = "0123456789abcdef" * 4
    resolved = detect_address(account_id)
    assert resolved["raw_form"] == "0:" + account_id