feat: add 17 new cross-exchange pairs (BG↔HL)

Added: ALGO, PYTH, SAND, ADA, HBAR, IOTA, MINA, FET, WLD,
       SUI, APT, NEAR, FIL, DYDX, JUP, TIA, MOVE

Removed: pixel and VET (fake 195% spreads on testnet)

Also updated GetHLSize() to handle szDecimals for all new coins.

run_test.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+cd /home/jack/Project/exchange-monitor-go
+# Redirect stderr to stdout so background mode captures everything
+./exchange-monitor 2>&1