⚡ Bolt: [performance improvement] Fast-path for integer timeouts

[ManupaKDU]

💡 What: Added a fast-path in is_reachable to check if timeout is an integer before attempting to cast it.
🎯 Why: To avoid the redundant isinstance(timeout, str) check, len(timeout) call, and the try...except block which performs int(timeout) for the default and most common input type (integers). This removes parsing and exception handling overhead in the hot-path.
📊 Impact: Slightly reduces CPU overhead per is_reachable call by bypassing several type checks and string conversion logic. While small individually, this overhead compounds across thousands of concurrent calls.
🔬 Measurement: Run python3 -m unittest test_testping1.py to ensure no functionality is broken and edge cases (like 0, negatives, and booleans) remain fully protected.

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PR created automatically by Jules for task 5444322586776349519 started by @ManupaKDU

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