NAS syndication adapter (feature-flagged off): push banner/text to Network Ad Space, reconcile delivery into unified credit pool

- nas.js: direct-MySQL writer mirroring CTB's proven payments+sponsorads path (approved:1, pid 1/2, catid 5, remaining counts DOWN)
- Create-time push for banner/text; pause/resume mirrors to NAS deactivate/topUp
- reconcileNas() 5-min loop: reads served, charges delta credits to the shared budget, stops NAS ad when budget dry
- Campaign row shows IAP + '+N net' network views (differentiated stats)
- Inert unless NAS_DB_* env is set; zero prod impact until enabled
- Also: rename Inbox sub-tab to 'Inbox Ads'

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

public/assets/my.js

@@ -342,7 +342,9 @@
         + '<th class="num">Spent</th><th class="num">Budget</th><th>Status</th><th></th></tr></thead><tbody>'
         + r.campaigns.map(c => '<tr><td><b>' + c.name + '</b></td>'
           + '<td>' + c.type + (c.type === 'banner' && c.width ? ' <span class="muted small">' + c.width + '×' + c.height + '</span>' : '') + '</td>'
-          + '<td class="num">' + c.imps.toLocaleString() + '</td><td class="num">' + c.clicks + '</td>'
+          + '<td class="num">' + c.imps.toLocaleString()
+            + (c.impsNas ? ' <span class="muted small" title="views across the network">+' + c.impsNas.toLocaleString() + ' net</span>' : '')
+            + '</td><td class="num">' + c.clicks + '</td>'
           + '<td class="num">' + c.spent + '</td><td class="num">' + c.budget + '</td>'
           + '<td>' + (c.status === 'out' ? '<span class="badge amber">budget spent</span>' : c.status) + '</td>'
           + '<td>' + (c.status === 'active' ? '<button class="btn small sec" data-camp="' + c.id + '" data-act="pause">Pause</button>'