feat: unify alerts into one plugin, channels, rules and inbox

drizzle/sqlite/0054_superb_guardian.sql

@@ -0,0 +1,6 @@
+-- dismissed_alerts and notification_channels moved to the alerts plugin. It
+-- renames the first into its own namespace and copies the second at
+-- activation, both after this migration, so a real DROP TABLE here would
+-- delete them first. notification_channels stays in place, unused, until
+-- 3.0.0.
+SELECT 1;

drizzle/sqlite/meta/_journal.json

@@ -379,6 +379,13 @@
       "when": 1790304468233,
       "tag": "0053_bent_absorbing_man",
       "breakpoints": true
+    },
+    {
+      "idx": 54,
+      "version": "6",
+      "when": 1790370151385,
+      "tag": "0054_superb_guardian",
+      "breakpoints": true
     }
   ]
 }