refactor(admin): separate business logic into game and tournament services

Move transaction handling, rejudge workflow, tournament bracket creation,
and data repair logic from admin handler into game.Service and
tournament.Service, mirroring the earlier api package separation.

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

1 files changed, 41 insertions, 0 deletions

diff --git a/backend/tournament/service_test.go b/backend/tournament/service_test.go
index d1ca78c..c43fb4e 100644
--- a/backend/tournament/service_test.go
+++ b/backend/tournament/service_test.go
@@ -95,3 +95,44 @@ func TestFindSeedByUserID(t *testing.T) {
 		t.Errorf("expected seed 0 for unknown user, got %d", got)
 	}
 }
+
+func TestNextPowerOf2(t *testing.T) {
+	tests := []struct {
+		input    int
+		expected int
+	}{
+		{2, 2},
+		{3, 4},
+		{4, 4},
+		{5, 8},
+		{6, 8},
+		{7, 8},
+		{8, 8},
+		{9, 16},
+	}
+	for _, tt := range tests {
+		got := nextPowerOf2(tt.input)
+		if got != tt.expected {
+			t.Errorf("nextPowerOf2(%d) = %d, want %d", tt.input, got, tt.expected)
+		}
+	}
+}
+
+func TestLog2Int(t *testing.T) {
+	tests := []struct {
+		input    int
+		expected int
+	}{
+		{1, 0},
+		{2, 1},
+		{4, 2},
+		{8, 3},
+		{16, 4},
+	}
+	for _, tt := range tests {
+		got := log2Int(tt.input)
+		if got != tt.expected {
+			t.Errorf("log2Int(%d) = %d, want %d", tt.input, got, tt.expected)
+		}
+	}
+}