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

pezcumulus/test/service/src/cli.rs

@@ -328,10 +328,11 @@ impl BizinikiwiCli for TestCollatorCli {
 					2500,
 				)))) as Box<_>
 			},
-			"relay-parent-offset" =>
+			"relay-parent-offset" => {
 				Box::new(pezcumulus_test_service::get_relay_parent_offset_chain_spec(Some(
 					ParaId::from(2600),
-				))) as Box<_>,
+				))) as Box<_>
+			},
 			path => {
 				let chain_spec: pezsc_chain_spec::GenericChainSpec =
 					pezsc_chain_spec::GenericChainSpec::from_json_file(path.into())?;