fix(config): ARM64 ignores db.engine config instead of failing

On ARM64, LevelDB is not available at build time. Instead of throwing
an exception that breaks default config startup, warn and override
to RocksDB. Also uses equalsIgnoreCase for consistency.

Author: vividctrlalt

framework/src/main/java/org/tron/core/config/args/Args.java

@@ -136,13 +136,14 @@ public static void setParam(final String[] args, final String confFileName) {
 
   /**
    * Validate final configuration after all sources (defaults, config, CLI) are applied.
+   * ARM64 only supports RocksDB; db.engine config is ignored with a warning.
    */
   public static void validateConfig() {
-    if (Arch.isArm64() && !"ROCKSDB".equals(PARAMETER.storage.getDbEngine())) {
-      throw new TronError(
-          "ARM64 architecture only supports RocksDB. Current engine: "
-              + PARAMETER.storage.getDbEngine(),
-          TronError.ErrCode.PARAMETER_INIT);
+    if (Arch.isArm64()
+        && !Constant.ROCKSDB.equalsIgnoreCase(PARAMETER.storage.getDbEngine())) {
+      logger.warn("ARM64 only supports RocksDB, ignoring db.engine='{}'",
+          PARAMETER.storage.getDbEngine());
+      PARAMETER.storage.setDbEngine(Constant.ROCKSDB);
     }
   }