style: fix code alignment and indentation consistency

- Correct indentation in goroutine leak test setup block
- Align struct field tags in BookMatch and all matching methods for
  consistent column-style formatting (media_item_id, bookhoard_uuid,
  confidence, match_method)
- Improves code readability and adheres to project indentation guidelines

cmd/server/tests/goroutine_leak_test.go

@@ -18,7 +18,7 @@ func TestGoroutineCleanup(t *testing.T) {
 	t.Logf("Initial goroutine count: %d", initialGoroutines)
 
 	// Start server
-setup := setupTestServer(t)
+	setup := setupTestServer(t)
 	defer setup.Close()
 
 	// Wait for startup