Split API into phase-specific endpoint files

Endpoints/StateEndpoints.cs

@@ -0,0 +1,45 @@
+using GameList.Contracts;
+using GameList.Data;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.AspNetCore.Mvc;
+
+namespace GameList.Endpoints;
+
+public static class StateEndpoints
+{
+    public static void MapStateEndpoints(this IEndpointRouteBuilder app)
+    {
+        app.MapGet("/api/state", async (AppDbContext db) =>
+        {
+            var state = await db.AppState.AsNoTracking().FirstAsync();
+            var summary = new
+            {
+                state.CurrentPhase,
+                state.UpdatedAt,
+                Players = await db.Players.CountAsync(),
+                Suggestions = await db.Suggestions.CountAsync(),
+                Votes = await db.Votes.CountAsync()
+            };
+            return Results.Ok(summary);
+        });
+
+        app.MapGet("/api/me", async (HttpContext ctx, AppDbContext db) =>
+        {
+            var player = await EndpointHelpers.GetOrCreatePlayer(ctx, db);
+            return Results.Ok(new { player.Id, player.DisplayName });
+        });
+
+        app.MapPost("/api/me/name", async ([FromBody] SetNameRequest request, HttpContext ctx, AppDbContext db) =>
+        {
+            if (string.IsNullOrWhiteSpace(request.Name) || request.Name.Length > 64)
+            {
+                return Results.BadRequest(new { error = "Name is required and must be <= 64 characters." });
+            }
+
+            var player = await EndpointHelpers.GetOrCreatePlayer(ctx, db);
+            player.DisplayName = request.Name.Trim();
+            await db.SaveChangesAsync();
+            return Results.Ok(new { player.Id, player.DisplayName });
+        });
+    }
+}