Feature/async polling pool 578

[mijinummi]

Description

This PR addresses Issue #578, refactoring regional exchange polling loops onto a non-blocking asynchronous coroutine structure using asyncio.gather.

Key Modifications

• Concurrent Async Migration: Replaced the legacy sequential polling loop inside src/network/polling.py with parallel aiohttp task groups.
• Strict Boundary Timeouts: Wrapped individual endpoint loops in an automated asyncio timeout filter, forcing connection teardowns at a 2500ms cap.
• Fault Isolation Protections: Ensured that timeout penalties or connectivity failures in unstable regions are logged locally and isolated cleanly, preventing them from stalling healthy network channels.

Closes #578

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