dash(slice1): web_server 3-way reconcile onto master SSOT base

master already absorbed the embedded web_server work via the S5/S6 slice
campaign (hpp byte-identical; cpp diverged only on the coin-node seam API).
Resolve the seam to master SSOT (set_coin_node/ICoinNode), and re-apply the
one genuinely-additive embedded-only hunk (share_version per blockchain).
Compiling base for the embedded S7/S8 source slices to land on.

Author: frstrtr

src/core/web_server.cpp

@@ -4709,6 +4709,17 @@ nlohmann::json MiningInterface::rest_web_currency_info()
     default:                   result["share_version"] = 36; break;
     }
 
+    // p2pool share version for the current coin — consumed by the
+    // bundled @c2pool/sharechain-explorer to classify share cells.
+    // Dash = v16, LTC/DOGE/BTC = v36.
+    switch (m_blockchain) {
+    case Blockchain::DASH:     result["share_version"] = 16; break;
+    case Blockchain::LITECOIN:
+    case Blockchain::BITCOIN:
+    case Blockchain::DOGECOIN:
+    default:                   result["share_version"] = 36; break;
+    }
+
     return result;
 }