Improve telego client robustness and retries

Add a createRobustFastHTTPClient helper to configure fasthttp.Client with better timeouts, connection limits, retries and optional SOCKS5 proxy dialing. Validate and sanitize proxy and API server URLs instead of returning early on invalid values, and build telego.Bot options dynamically. Reduce long-polling timeout to detect connection issues faster and adjust update retrieval comments. Implement exponential-backoff retry logic for SendMessage calls to handle transient connection/timeouts and improve delivery reliability; also reduce inter-message delay for better throughput.

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