remote_gateway: add TCP OpenKore endpoint mode, PowerShell starter and docs for Windows/pt-BR

[boscv]

Motivation

• Add support for connecting the remote gateway to OpenKore over TCP in addition to the existing Unix socket mode to improve Windows and cross-host compatibility.
• Provide user-facing documentation and a convenience startup script for Windows users and Portuguese-speaking operators to simplify setup and reduce configuration errors.

Description

• tools/remote_gateway.pl: added --kore-host and --kore-port flags and logic to connect via IO::Socket::INET when both are provided, while keeping Unix socket support when available, plus runtime validation and endpoint reporting via kore_endpoint_string() and health payload updates.
• Improved runtime robustness by detecting availability of Unix sockets, handling SIGPIPE, and providing clearer error messages when arguments are invalid or Unix sockets are unavailable.
• Updated health/readiness payload and log messages to include the chosen OpenKore endpoint and added config fields kore_host, kore_port, and kore_endpoint.
• Documentation updates: added TCP usage notes to docs/gateway-core.md and a small --kore-host/--kore-port mention to docs/deploy-hardening.md.
• New user docs: added docs/guia-acesso-remoto-pt-br.md (full Portuguese guide) and docs/guia-acesso-remoto-windows-nativo.md (Windows-native guide).
• New helper: added tools/start-gateway.ps1 PowerShell script that bootstraps Windows deployment (auto-creates config/log/data dirs, copies user template, validates args, starts the gateway in TCP mode and performs a health check).

Testing

• No automated test run was performed as part of this change; please run the smoke/unit checks: perl src/test/unittests.pl RemoteGatewaySmokeTest and ./tools/check_gateway_release.sh in your environment to validate the gateway startup and basic flows.

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Validate --kore-port range before starting gateway

The new TCP argument validation only checks whether --kore-port is zero, so invalid values like -1 or 70000 are accepted instead of failing fast. In practice this leads to incorrect behavior: negative ports skip TCP mode and silently fall back to Unix socket logic, while ports above 65535 are truncated by IO::Socket::INET (e.g. 70000 -> 4464), which can make the gateway target an unintended endpoint. This should reject any TCP port outside 1..65535 when --kore-host is provided.

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