feat: Store update restart context in the deployment directory and configure Docker to use the default bun user.

bot/commands/admin/update.ts

@@ -213,6 +213,18 @@ async function handleDeploy(interaction: any) {
         });
 
         if (result.success) {
+            // Save restart context so we can notify on startup
+            await UpdateService.prepareRestartContext({
+                channelId: interaction.channelId,
+                userId: interaction.user.id,
+                timestamp: Date.now(),
+                runMigrations: true, // Always check migrations on deploy
+                installDependencies: false, // Handled by Docker build
+                buildWebAssets: false, // Handled by Docker build
+                previousCommit: result.previousCommit,
+                newCommit: result.newCommit
+            });
+
             await interaction.editReply({
                 embeds: [getDeploySuccessEmbed(
                     result.previousCommit,