feat(data): seed default Lists (My Day, Important, Planned)

src/ClaudeDo.Data/Seeding/DefaultListsSeeder.cs

@@ -0,0 +1,25 @@
+using ClaudeDo.Data.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace ClaudeDo.Data.Seeding;
+
+public static class DefaultListsSeeder
+{
+    private static readonly string[] Defaults = { "My Day", "Important", "Planned" };
+
+    public static async Task SeedAsync(ClaudeDoDbContext ctx, CancellationToken ct = default)
+    {
+        var existing = await ctx.Lists.Select(l => l.Name).ToListAsync(ct);
+        var now = DateTime.UtcNow;
+        foreach (var name in Defaults.Where(n => !existing.Contains(n)))
+        {
+            ctx.Lists.Add(new ListEntity
+            {
+                Id = Guid.NewGuid().ToString("N"),
+                Name = name,
+                CreatedAt = now,
+            });
+        }
+        await ctx.SaveChangesAsync(ct);
+    }
+}