fix(cli-wallet): use canonical RTC hex addresses

[eliasx45]

Summary

Fixes #6518.

This updates the legacy tools/cli-wallet address path so it no longer emits or accepts Base58-style RTC... addresses. It now aligns with the canonical RustChain format used by the current wallet/docs: RTC plus 40 hexadecimal characters.

Changes

• Generate addresses as RTC + first 40 hex chars of SHA-256 over the wallet public key bytes.
• Validate addresses with exact RTC[0-9a-fA-F]{40} semantics.
• Update CLI wallet README examples and troubleshooting text.
• Remove the now-unused base58 dependency from the legacy CLI wallet crate.
• Extend the existing unit tests to reject legacy Base58-shaped, short, long, and non-hex RTC addresses.

Verification

Local Windows host does not currently have Cargo installed, so I could not run the Rust crate tests locally.

Static checks performed:

git diff --check -- tools\cli-wallet
rg -n 'base58' tools\cli-wallet -S

The first check passed. The second check returns no remaining Base58 usage in tools/cli-wallet.

[eliasx45]

CI follow-up: the initial run failed during Python test collection before reaching this wallet change because node/gpu_render_endpoints.py had a syntax error in the current base tree (expected except or finally block).

I added a second tiny commit that restores the intended indentation for the GPU release settlement block. Local verification for that unblocker:

.venv\Scripts\python.exe -m py_compile node\gpu_render_endpoints.py
.venv\Scripts\python.exe -m pytest -q tests\test_gpu_render_endpoints_security.py --tb=short
# 11 passed

Cargo is still unavailable on this Windows host, so the tools/cli-wallet Rust tests are left for GitHub CI.

[eliasx45]

Follow-up on the second CI run:

• The branch-specific targeted checks still pass locally:

.venv\Scripts\python.exe -m py_compile node\gpu_render_endpoints.py
.venv\Scripts\python.exe -m pytest -q tests\test_gpu_render_endpoints_security.py tests\test_wallet_cli_39.py --tb=short
# 19 passed

git diff --check origin/main...HEAD
# clean

• The current blocking test job now runs the full Python suite and fails in unrelated areas outside this PR's touched files, including Beacon Atlas, bridge lock ledger, tx handler auth/limits, monitor payload shape, pinned miner hashes, and wallet network utility tests.
• Other currently open RustChain PRs such as docs: correct miner installer and service commands in START_HERE.md #6517 and fix: protect sophia governor recent events #6514 are also failing the same broad test job, so this looks like a broader base-suite state rather than a failure specific to the CLI-wallet address patch.