Add Binance symbol-sync validation and VPS requirements hardening

[EJMM17]

Motivation

• Prevent runtime failures caused by misformatted or non-tradable Binance pairs by validating configured symbols before live trading starts.
• Make the Binance adapter tolerant of common symbol formats and reduce surprises from exchange responses during order/candle/ticker flows.
• Provide clear VPS requirements and preflight steps so deployments to a VPS are stable and avoid timestamp/recvWindow issues.

Description

• Added symbol normalization and symbol-sync APIs to the Binance adapter: _normalize_symbol(), get_exchange_symbols() (5 minute cache) and validate_symbols() in darwin_agent/exchanges/binance.py and applied normalization in get_candles, get_ticker, place_order, close_position, and set_leverage.
• Added startup preflight validate_exchange_symbol_sync() in darwin_agent/main.py and invoked it after router.connect_all() so mode=live fails fast on invalid/non-tradable Binance symbols.
• Hardened router lifecycle compatibility by ensuring ExchangeRouter exposes backward-compatible hooks (connect_all, get_all_statuses, disconnect_all, close) and adjusted set_leverage result propagation in darwin_agent/exchanges/router.py.
• Added a Spanish VPS runbook MAINNET_VPS_RUNBOOK_ES.md with minimum VPS requirements, secure env handling, systemd service, preflight checks and update/kill-switch procedures.
• Added/extended tests in test_binance_adapter_safety.py, test_main_runtime_compat.py, and test_router_set_leverage.py covering symbol normalization, exchangeInfo caching, validation behavior, and router hooks.

Testing

• Ran pytest -q test_binance_adapter_safety.py test_main_runtime_compat.py test_router_set_leverage.py and all tests passed (12 passed).
• Ran python -m compileall -q darwin_agent with no errors reported.

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