feat: split Z Ecosystem from OMNL/DBIS with separate builds and deploy

Add VITE_ECOSYSTEM build profiles, Z-only nginx vhosts, standalone Z production stack script, and remove Z Chain from OMNL registry.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend-dapp/scripts/portal-serve.mjs

@@ -12,8 +12,7 @@ const DIST = path.join(__dirname, '..', 'dist');
 const PORT = Number(process.env.PORT || process.env.OMNL_BANK_FRONTEND_PORT || 3002);
 const API_TARGET = process.env.TOKEN_AGGREGATION_URL || 'http://127.0.0.1:3000';
 const SETTLEMENT_TARGET = process.env.SETTLEMENT_URL || process.env.SETTLEMENT_MIDDLEWARE_URL || 'http://127.0.0.1:3011';
-const EXCHANGE_TARGET = process.env.EXCHANGE_URL || 'https://exchange.omdnl.org';
-
+const EXCHANGE_TARGET = process.env.EXCHANGE_URL || '';
 const MIME = {
   '.html': 'text/html; charset=utf-8',
   '.js': 'application/javascript; charset=utf-8',
@@ -103,17 +102,15 @@ const server = http.createServer((req, res) => {
     );
   }
   if (url.startsWith('/exchange')) {
+    if (!EXCHANGE_TARGET) {
+      res.writeHead(404, { 'Content-Type': 'application/json' });
+      return res.end(JSON.stringify({ error: 'not_available', message: 'Z Ecosystem only' }));
+    }
     return proxyRequest(req, res, EXCHANGE_TARGET);
   }
   if (url.startsWith('/omnl/')) {
-    if (shouldServeOmnlStatic(url)) {
-      const file = resolveStatic(url);
-      if (file) {
-        const cache = url.startsWith('/omnl/static/') ? 'public, max-age=31536000, immutable' : 'no-cache';
-        return sendFile(res, file, cache);
-      }
-    }
-    return proxyRequest(req, res, API_TARGET);
+    res.writeHead(404, { 'Content-Type': 'application/json' });
+    return res.end(JSON.stringify({ error: 'not_available', message: 'Z Ecosystem only' }));
   }
 
   const file = resolveStatic(url === '/' ? '/index.html' : url);