Add master dashboard reporter and settings UI

- New reporter module that pushes firm stats (total accounts, accounts
  traded, in trade) to a configurable master dashboard every 30 seconds
- Add Instance Name and Dashboard URL fields to the settings page
- Register master_dashboard_url and instance_name in settings API
- Seed default (empty) values for new settings in db

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude/launch.json

@@ -6,7 +6,7 @@
       "runtimeExecutable": "C:\\Program Files\\nodejs\\npm.cmd",
       "runtimeArgs": ["run", "dev", "--", "--webpack"],
       "port": 3000,
-      "cwd": "D:\\Development\\market-dev\\autotrader-firms\\autotrader"
+      "cwd": "."
     }
   ]
 }