fix: adminnotify observability — money-critical rows sort first, flood-cap suppression surfaced to operator, stale coordination doc fixed

- notifications priority ordering: money-critical reasons (webhooks, sweeps, refunds, gift-card, manual-refund failures) above routine
- admin notifications page exposes the flood-cap suppressed count
- adminnotify.go contract doc: removed stale 2FA reissue-fail site, current insert-site list

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

frontend/package.json

@@ -29,7 +29,6 @@
 		"@tailwindcss/vite": "^4.2.0",
 		"@types/geojson": "^7946.0.16",
 		"@types/node": "^26.1.1",
-		"@vitest/coverage-v8": "^4.1.10",
 		"bits-ui": "^2.16.1",
 		"clsx": "^2.1.1",
 		"eslint": "^9.39.5",