Revert "Add duplicate operation ids validation"

This reverts commit a1bc17f.

Author: ViacheslavKlimov

generate-client.sh

@@ -142,16 +142,6 @@ generate() {
     exit 1
   }
 
-  # Detect duplicate operationIds (ThingsBoard's spec generator appends _1, _2, etc.)
-  local duplicates
-  duplicates=$(grep -o '"operationId" *: *"[^"]*"' "$spec_file" | sed 's/.*: *"//;s/"//' | grep -E '_[0-9]+$' || true)
-  if [ -n "$duplicates" ]; then
-    echo "Error: spec contains duplicate operationIds (suffixed by ThingsBoard):"
-    echo "$duplicates" | sed 's/^/  /'
-    echo "Fix the @ApiOperation annotations in ThingsBoard source to use unique names."
-    exit 1
-  fi
-
   # Run 1 — Java client (single class, no docs)
   echo "Generating client for edition: $edition from $spec_file"
   openapi-generator-cli generate \