feat(dlob): support two sources + per-user switch

- Add "source" column + composite PKs for DLOB tables\n- Filter public Hasura selects by X-Hasura-Dlob-Source\n- Run parallel workers for mevnode + dlob.drift.trade\n- Frontend proxy sets x-hasura-dlob-source from cookie and injects UI switch

kustomize/base/dlob-slippage-worker/worker.mjs

@@ -55,6 +55,7 @@ function resolveConfig() {
     tokens.hasuraAdminSecret;
   const hasuraAuthToken = process.env.HASURA_AUTH_TOKEN || process.env.HASURA_JWT || undefined;
 
+  const dlobSource = String(process.env.DLOB_SOURCE || 'mevnode').trim() || 'mevnode';
   const markets = envList('DLOB_MARKETS', 'PUMP-PERP,SOL-PERP,1MBONK-PERP,BTC-PERP,ETH-PERP');
   const pollMs = clampInt(process.env.DLOB_POLL_MS, 250, 60_000, 1000);
 
@@ -77,6 +78,7 @@ function resolveConfig() {
     hasuraUrl,
     hasuraAdminSecret,
     hasuraAuthToken,
+    dlobSource,
     markets,
     pollMs,
     sizesUsd,
@@ -209,6 +211,7 @@ async function main() {
         startedAt: getIsoNow(),
         hasuraUrl: cfg.hasuraUrl,
         hasuraAuth: cfg.hasuraAuthToken ? 'bearer' : cfg.hasuraAdminSecret ? 'admin-secret' : 'none',
+        dlobSource: cfg.dlobSource,
         markets: cfg.markets,
         pollMs: cfg.pollMs,
         sizesUsd: cfg.sizesUsd,
@@ -226,8 +229,9 @@ async function main() {
 
     try {
       const query = `
-        query DlobL2Latest($markets: [String!]!) {
-          dlob_l2_latest(where: { market_name: { _in: $markets } }) {
+        query DlobL2Latest($source: String!, $markets: [String!]!) {
+          dlob_l2_latest(where: { source: { _eq: $source }, market_name: { _in: $markets } }) {
+            source
             market_name
             market_type
             market_index
@@ -242,7 +246,7 @@ async function main() {
         }
       `;
 
-      const data = await graphqlRequest(cfg, query, { markets: cfg.markets });
+      const data = await graphqlRequest(cfg, query, { source: cfg.dlobSource, markets: cfg.markets });
       const rows = Array.isArray(data?.dlob_l2_latest) ? data.dlob_l2_latest : [];
 
       const objectsV1 = [];
@@ -277,6 +281,7 @@ async function main() {
           {
             const sim = simulateFill(asks, sizeUsd);
             const baseObj = {
+              source: cfg.dlobSource,
               market_name: market,
               side: 'buy',
               market_type: row?.market_type ?? 'perp',
@@ -302,6 +307,7 @@ async function main() {
           {
             const sim = simulateFill(bids, sizeUsd);
             const baseObj = {
+              source: cfg.dlobSource,
               market_name: market,
               side: 'sell',
               market_type: row?.market_type ?? 'perp',