style: Migrate to stable-only rustfmt configuration

- Remove nightly-only features from .rustfmt.toml and vendor/ss58-registry/rustfmt.toml
- Removed features: imports_granularity, wrap_comments, comment_width,
  reorder_impl_items, spaces_around_ranges, binop_separator,
  match_arm_blocks, trailing_semicolon, trailing_comma
- Format all 898 affected files with stable rustfmt
- Ensures long-term reliability without nightly toolchain dependency

bizinikiwi/pezframe/revive/rpc/examples/remark-extrinsic.rs

@@ -14,9 +14,9 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-use pezpallet_revive_eth_rpc::subxt_client::{self, system::calls::types::Remark, SrcChainConfig};
 use pezkuwi_subxt::OnlineClient;
 use pezkuwi_subxt_signer::sr25519::dev;
+use pezpallet_revive_eth_rpc::subxt_client::{self, system::calls::types::Remark, SrcChainConfig};
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {