feat: remove legacy alert rules, superseded by automations

Alert rules already auto-migrate into automations on boot and the old
engine stands down after. Deletes the rule/firing tables, routes, UI,
and AI tools; keeps notification channels since automations still use
them. Also fixes automations' notify step, which still called the
deleted repository.

src/ui/locales/translated/af_ZA.json

@@ -287,7 +287,6 @@
     "loading": "Laai tans...",
     "noData": "Geen data beskikbaar nie",
     "allClear": "Alles duidelik",
-    "acknowledgeAlert": "Erken",
     "noPingUrls": "Geen URL'e gekonfigureer nie",
     "pingLabel": "Etiket",
     "addPingUrl": "Voeg URL by",
@@ -324,8 +323,6 @@
     "widgetMetricsChartDesc": "Historiese SVE-, geheue-, skyf- of netwerkgrafiek vir 'n gasheer",
     "widgetHostGridName": "Gasheerrooster",
     "widgetHostGridDesc": "Roosteraansig van SSH-gasheerstatusse",
-    "widgetAlertFeedName": "Waarskuwingsvoer",
-    "widgetAlertFeedDesc": "Regstreekse waarskuwingsvuurwerke met erkenningsondersteuning",
     "widgetPingStatusName": "Ping-status",
     "widgetPingStatusDesc": "HTTP-pingstatus vir een of meer URL'e",
     "widgetRecentActivityName": "Onlangse Aktiwiteit",
@@ -747,7 +744,6 @@
     "portForwarding": "Aanstuur",
     "sftp": "SFTP",
     "connections": "Verbindings",
-    "alerts": "Waarskuwings",
     "serial": "Reeks",
     "keepSideMenuOpen": "Hou Kieslys Oop",
     "collapseSideMenu": "Vou Kieslys in",
@@ -4890,21 +4886,6 @@
     "viewHistory": "Bekyk Geskiedenis"
   },
   "alerts": {
-    "tabFirings": "Waarskuwings",
-    "tabRules": "Reëls",
-    "tabChannels": "Kanale",
-    "noFirings": "Geen onerkende waarskuwings nie",
-    "noRules": "Geen waarskuwingsreëls opgestel nie",
-    "noChannels": "Geen kennisgewingkanale gekonfigureer nie",
-    "rulesDesc": "Waarskuwingsreëls aktiveer kennisgewings",
-    "channelsDesc": "Waar waarskuwingskennisgewings gestuur word",
-    "acknowledge": "Erken",
-    "ackAll": "Bevestig alles",
-    "allAcknowledged": "Alle waarskuwings erken",
-    "ackFailed": "Kon nie waarskuwing erken nie",
-    "ackAllFailed": "Kon nie alle waarskuwings erken nie",
-    "showAcknowledged": "Wys alles",
-    "hideAcknowledged": "Versteek Goedgekeur",
     "addChannel": "Voeg kanaal by",
     "editChannel": "Wysig kanaal",
     "channelName": "Naam",
@@ -4917,22 +4898,7 @@
     "ntfyTopic": "Onderwerp",
     "ntfyTopicRequired": "Onderwerp is vereis",
     "ntfyToken": "Toegangstoken (opsioneel)",
-    "channelSaveFailed": "Kon nie kanaal stoor nie",
-    "test": "Toets",
-    "testSent": "Toetskennisgewing gestuur",
-    "testFailed": "Toetskennisgewing het misluk",
-    "testFailedWithReason": "Toetskennisgewing het misluk: {{reason}}",
-    "addRule": "Voeg waarskuwingsreël by",
-    "editRule": "Wysig waarskuwingsreël",
-    "ruleName": "Reëlnaam",
-    "ruleNameRequired": "Naam word vereis",
-    "triggerType": "Sneller",
-    "thresholdValue": "Drempel (%)",
-    "durationSeconds": "Duur (sekondes, 0 = onmiddellike vuur)",
-    "cooldownMinutes": "Afkoeltyd (minute)",
-    "channels": "Kennisgewingskanale",
-    "noChannelsHint": "Voeg eers kanale by die Kanale-oortjie",
-    "ruleSaveFailed": "Kon nie reël stoor nie"
+    "channelSaveFailed": "Kon nie kanaal stoor nie"
   },
   "ai": {
     "title": "Assistent",