feat(http): ArenaTwoPickBattleController (do_matching stub + finish)

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

SVSim.EmulatedEntrypoint/Controllers/ArenaTwoPickBattleController.cs

@@ -0,0 +1,47 @@
+using Microsoft.AspNetCore.Mvc;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Requests.ArenaTwoPick;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Responses.ArenaTwoPick;
+using SVSim.EmulatedEntrypoint.Services;
+
+namespace SVSim.EmulatedEntrypoint.Controllers;
+
+[Route("arena_two_pick_battle")]
+public class ArenaTwoPickBattleController : SVSimController
+{
+    private readonly IArenaTwoPickService _svc;
+    public ArenaTwoPickBattleController(IArenaTwoPickService svc) => _svc = svc;
+
+    [HttpPost("do_matching")]
+    public IActionResult DoMatching([FromBody] DoMatchingRequest req)
+    {
+        if (!TryGetViewerId(out _)) return Unauthorized();
+        return Ok(new DoMatchingResponseDto());
+    }
+
+    [HttpPost("finish")]
+    public async Task<IActionResult> Finish([FromBody] BattleFinishRequest req)
+    {
+        if (!TryGetViewerId(out var vid)) return Unauthorized();
+        try
+        {
+            var result = await _svc.RecordBattleResultAsync(vid, req.BattleResult == 1);
+            return Ok(new BattleFinishResponseDto
+            {
+                BattleResult = result.BattleResult,
+                GetClassExperience = result.GetClassExperience,
+                ClassExperience = result.ClassExperience,
+                ClassLevel = result.ClassLevel,
+                SpotPointInfo = new SpotPointInfoDto
+                {
+                    BeforeSpotPoint = result.BeforeSpotPoint,
+                    AddSpotPoint = result.AddSpotPoint,
+                    AfterSpotPoint = result.AfterSpotPoint,
+                },
+            });
+        }
+        catch (ArenaTwoPickException ex)
+        {
+            return BadRequest(new { error_code = ex.ErrorCode });
+        }
+    }
+}