fix: redact validator private keys from RPC

[MuncleUscles]

What changed

• recursively remove private-key fields from public transaction RPC payloads by default
• keep stored/internal receipt data intact for Studio rollup-event signing
• allow local inspection with SHOW_VALIDATOR_PRIVATE_KEYS_IN_RPC=true
• cover transaction, Studio transaction, address history, block, and status-update responses

Why

Validator execution records include generated EOA keys used internally by Studio. Returning those values from public transaction RPC methods causes them to be mistaken for credentials that confer validator consensus authority.

Impact

Existing RPC callers no longer receive private-key fields unless the explicit opt-in configuration is enabled. Internal consensus and rollup signing behavior is unchanged.

Validation

• pytest -q tests/unit/test_rpc_methods.py tests/unit/protocol_rpc/test_log_event_redaction.py (14 passed)
• Black check passed
• git diff --check passed
• plain full E2E matrix passed

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[MuncleUscles]

/run-e2e default v0.5 all studio

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
80.8% Coverage on New Code
1.4% Duplication on New Code

See analysis details on SonarQube Cloud

[MuncleUscles]

/run-e2e default v0.5 all studio

[MuncleUscles]

/run-e2e