build(infra): KIS API 클라이언트 시그니처 일원화 및 빌드 수정

- 수정: KisApiClient 메서드 반환 타입 Task<string> → Task<Dictionary<string, object>>로 통일
- 수정: GetOrRefreshTokenAsync ReadAsAsync → ReadFromJsonAsync로 변경
- 수정: PlaceholderKisApiClient IKisApiClient 인터페이스 완전 구현
- 수정: CollectionEndpoints 모든 WithOpenApi() 호출 제거
- 수정: Program.cs using 지시문 순서 재정렬
- 추가: Client/_Imports.razor Fluent UI 컴포넌트 네임스페이스 정의

이제 빌드 성공: QuantEngine.Web 프로젝트 컴파일 완료 (경고 0, 에러 0)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/dotnet/QuantEngine.Web/Endpoints/CollectionEndpoints.cs

@@ -8,44 +8,37 @@ public static class CollectionEndpoints
     public static void MapCollectionEndpoints(this WebApplication app)
     {
         var group = app.MapGroup("/api/collection")
-            .WithName("Collection")
-            .WithOpenApi();
+            .WithName("Collection");
 
         group.MapGet("/state", GetCollectionState)
             .WithName("GetCollectionState")
-            .WithOpenApi()
             .Produces(200)
             .Produces(500);
 
         group.MapGet("/runs", GetRecentRuns)
             .WithName("GetRecentRuns")
-            .WithOpenApi()
             .Produces(200)
             .Produces(500);
 
         group.MapGet("/runs/{runId}/snapshots", GetRunSnapshots)
             .WithName("GetRunSnapshots")
-            .WithOpenApi()
             .Produces(200)
             .Produces(404)
             .Produces(500);
 
         group.MapGet("/runs/{runId}/errors", GetRunErrors)
             .WithName("GetRunErrors")
-            .WithOpenApi()
             .Produces(200)
             .Produces(404)
             .Produces(500);
 
         group.MapGet("/latest/{ticker}", GetLatestSnapshotsForTicker)
             .WithName("GetLatestSnapshotsForTicker")
-            .WithOpenApi()
             .Produces(200)
             .Produces(500);
 
         group.MapPost("/run", StartCollectionRun)
             .WithName("StartCollectionRun")
-            .WithOpenApi()
             .Produces(202)
             .Produces(500);
     }
@@ -57,7 +50,7 @@ public static class CollectionEndpoints
             var state = await repo.GetDashboardStateAsync();
             return Results.Ok(state);
         }
-        catch (Exception ex)
+        catch
         {
             return Results.StatusCode(500);
         }
@@ -70,7 +63,7 @@ public static class CollectionEndpoints
             var runs = await repo.GetRecentRunsAsync(limit);
             return Results.Ok(new { runs, count = runs.Count });
         }
-        catch (Exception ex)
+        catch
         {
             return Results.StatusCode(500);
         }
@@ -83,7 +76,7 @@ public static class CollectionEndpoints
             var snapshots = await repo.GetRunSnapshotsAsync(runId);
             return Results.Ok(new { runId, snapshots, count = snapshots.Count });
         }
-        catch (Exception ex)
+        catch
         {
             return Results.StatusCode(500);
         }
@@ -96,7 +89,7 @@ public static class CollectionEndpoints
             var errors = await repo.GetRunErrorsAsync(runId, limit);
             return Results.Ok(new { runId, errors, count = errors.Count });
         }
-        catch (Exception ex)
+        catch
         {
             return Results.StatusCode(500);
         }
@@ -109,7 +102,7 @@ public static class CollectionEndpoints
             var snapshots = await repo.GetLatestSnapshotsForTickerAsync(ticker, limit);
             return Results.Ok(new { ticker, snapshots, count = snapshots.Count });
         }
-        catch (Exception ex)
+        catch
         {
             return Results.StatusCode(500);
         }
@@ -170,7 +163,7 @@ public static class CollectionEndpoints
                 startedAt = now
             });
         }
-        catch (Exception ex)
+        catch
         {
             return Results.StatusCode(500);
         }