Use coins_plm.py as single source of truth for ElectrumX patch

- Remove inline Palladium coin definition from Dockerfile.electrumx
  and COPY coins_plm.py instead, reducing duplication
- Add TX_COUNT/TX_COUNT_HEIGHT/TX_PER_BLOCK to coins_plm.py with
  real chain data (457478 txs at height 382404)
- Update entrypoint.sh to fetch live TX stats from palladiumd at
  container startup, keeping sync estimates accurate automatically

entrypoint.sh

@@ -53,5 +53,41 @@ echo "RPC Port: ${RPC_PORT}"
 echo "DAEMON_URL: http://${RPC_USER}:***@palladiumd:${RPC_PORT}/"
 echo "=========================================="
 
+# Update TX_COUNT / TX_COUNT_HEIGHT in coins.py from the live node
+echo "Fetching chain tx stats from palladiumd..."
+TX_STATS=$(curl -sf --user "${RPC_USER}:${RPC_PASSWORD}" \
+  --data-binary '{"jsonrpc":"1.0","method":"getchaintxstats","params":[]}' \
+  -H 'Content-Type: text/plain;' \
+  "http://palladiumd:${RPC_PORT}/" 2>/dev/null || true)
+
+if [ -n "$TX_STATS" ]; then
+    TX_COUNT=$(echo "$TX_STATS" | python3 -c "import sys,json; print(json.load(sys.stdin)['result']['txcount'])" 2>/dev/null || true)
+    TX_HEIGHT=$(echo "$TX_STATS" | python3 -c "import sys,json; print(json.load(sys.stdin)['result']['window_final_block_height'])" 2>/dev/null || true)
+
+    if [ -n "$TX_COUNT" ] && [ -n "$TX_HEIGHT" ]; then
+        echo "Patching coins.py: TX_COUNT=${TX_COUNT}, TX_COUNT_HEIGHT=${TX_HEIGHT}"
+        python3 - "$TX_COUNT" "$TX_HEIGHT" <<'TXPATCH'
+import sys, pathlib, re
+tx_count, tx_height = sys.argv[1], sys.argv[2]
+for target in [
+    '/usr/local/lib/python3.13/dist-packages/electrumx/lib/coins.py',
+    '/electrumx/src/electrumx/lib/coins.py',
+]:
+    p = pathlib.Path(target)
+    if not p.exists():
+        continue
+    s = p.read_text()
+    s = re.sub(r'(class Palladium\(Bitcoin\):.*?TX_COUNT\s*=\s*)\d+', rf'\g<1>{tx_count}', s, count=1, flags=re.DOTALL)
+    s = re.sub(r'(class Palladium\(Bitcoin\):.*?TX_COUNT_HEIGHT\s*=\s*)\d+', rf'\g<1>{tx_height}', s, count=1, flags=re.DOTALL)
+    p.write_text(s)
+TXPATCH
+        echo ">> TX stats updated from live node"
+    else
+        echo ">> Could not parse tx stats, using defaults from coins_plm.py"
+    fi
+else
+    echo ">> Node not reachable yet, using defaults from coins_plm.py"
+fi
+
 # Execute the original electrumx command
 exec /usr/local/bin/electrumx_server