feat(daily-prep): add DailyPrepMaxTasks app setting

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ClaudeDo.Data/Migrations/20260603141020_DailyPrepMaxTasks.cs

@@ -0,0 +1,36 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ClaudeDo.Data.Migrations
+{
+    /// <inheritdoc />
+    public partial class DailyPrepMaxTasks : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "daily_prep_max_tasks",
+                table: "app_settings",
+                type: "INTEGER",
+                nullable: false,
+                defaultValue: 5);
+
+            migrationBuilder.UpdateData(
+                table: "app_settings",
+                keyColumn: "id",
+                keyValue: 1,
+                column: "daily_prep_max_tasks",
+                value: 5);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "daily_prep_max_tasks",
+                table: "app_settings");
+        }
+    }
+}