Add display_name_claim migration to schema init list

The 06-oidc-display-name-claim.sql migration was not registered in
ClickHouseConfig.SCHEMA_FILES, so the ALTER TABLE never ran on
existing deployments, causing startup failure when the repository
tried to SELECT the missing column.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cameleer3-server-app/src/main/java/com/cameleer3/server/app/config/ClickHouseConfig.java

@@ -28,7 +28,7 @@ public class ClickHouseConfig {
     private static final String[] SCHEMA_FILES = {
             "clickhouse/01-schema.sql", "clickhouse/02-search-columns.sql",
             "clickhouse/03-users.sql", "clickhouse/04-oidc-config.sql",
-            "clickhouse/05-oidc-auto-signup.sql"
+            "clickhouse/05-oidc-auto-signup.sql", "clickhouse/06-oidc-display-name-claim.sql"
     };
 
     private final DataSource dataSource;