feat: collapse plugin runtime to one tier behind a plugin SDK

drizzle/mysql/0026_empty_black_bird.sql

@@ -0,0 +1,3 @@
+ALTER TABLE `plugin_permission_grants` MODIFY COLUMN `granted_by` varchar(255);--> statement-breakpoint
+ALTER TABLE `plugin_permission_grants` ADD `source` text DEFAULT ('admin') NOT NULL;--> statement-breakpoint
+ALTER TABLE `plugins` ADD `last_error` text;

drizzle/mysql/meta/_journal.json

@@ -183,6 +183,13 @@
       "when": 1790083819606,
       "tag": "0025_wet_master_mold",
       "breakpoints": true
+    },
+    {
+      "idx": 26,
+      "version": "5",
+      "when": 1790102859925,
+      "tag": "0026_empty_black_bird",
+      "breakpoints": true
     }
   ]
 }