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

src/ClaudeDo.App/Program.cs

@@ -2,6 +2,7 @@ using Avalonia;
 using ClaudeDo.Data;
 using ClaudeDo.Data.Git;
 using ClaudeDo.Data.Repositories;
+using ClaudeDo.Data.Seeding;
 using ClaudeDo.Ui;
 using ClaudeDo.Ui.Services;
 using ClaudeDo.Ui.ViewModels;
@@ -28,8 +29,9 @@ sealed class Program
 
         using (var scope = services.CreateScope())
         {
-            ClaudeDoDbContext.MigrateAndConfigure(
-                scope.ServiceProvider.GetRequiredService<ClaudeDoDbContext>());
+            var db = scope.ServiceProvider.GetRequiredService<ClaudeDoDbContext>();
+            ClaudeDoDbContext.MigrateAndConfigure(db);
+            DefaultListsSeeder.SeedAsync(db).GetAwaiter().GetResult();
         }
 
         try

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);
+    }
+}

src/ClaudeDo.Installer/Steps/InitDatabaseStep.cs

@@ -1,4 +1,5 @@
 using ClaudeDo.Data;
+using ClaudeDo.Data.Seeding;
 using ClaudeDo.Installer.Core;
 using Microsoft.EntityFrameworkCore;
 
@@ -20,6 +21,7 @@ public sealed class InitDatabaseStep : IInstallStep
                 .Options;
             using var context = new ClaudeDoDbContext(options);
             ClaudeDoDbContext.MigrateAndConfigure(context);
+            DefaultListsSeeder.SeedAsync(context).GetAwaiter().GetResult();
 
             progress.Report("Schema applied successfully");
             return Task.FromResult(StepResult.Ok());