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/teyrchains/integration-tests/emulated/tests/pezbridges/bridge-hub-pezkuwichain/src/lib.rs

@@ -58,16 +58,14 @@ mod imports {
 				CustomizableAssetFromSystemAssetHub as PenpalCustomizableAssetFromSystemAssetHub,
 				UniversalLocation as PenpalUniversalLocation,
 			},
-			PenpalAParaPezpallet as PenpalAPallet,
-			PenpalAssetOwner,
+			PenpalAParaPezpallet as PenpalAPallet, PenpalAssetOwner,
 		},
 		pezbridge_hub_pezkuwichain_emulated_chain::{
 			genesis::ED as BRIDGE_HUB_PEZKUWICHAIN_ED, BridgeHubPezkuwichainExistentialDeposit,
 			BridgeHubPezkuwichainParaPezpallet,
 		},
 		pezkuwichain_emulated_chain::{
-			genesis::ED as PEZKUWICHAIN_ED,
-			PezkuwichainRelayPezpallet,
+			genesis::ED as PEZKUWICHAIN_ED, PezkuwichainRelayPezpallet,
 			PezkuwichainRelayPezpallet as PezkuwichainPallet,
 		},
 		AssetHubPezkuwichainPara as AssetHubPezkuwichain,