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

pezkuwi/primitives/src/v9/executor_params.rs

@@ -447,8 +447,9 @@ fn ensure_prep_hash_changes() {
 			PrecheckingMaxMemory(_) => continue,
 			PvfPrepTimeout(_, _) => continue,
 			PvfExecTimeout(_, _) => continue,
-			WasmExtBulkMemory =>
-				(ExecutorParams::default(), ExecutorParams::from(&[WasmExtBulkMemory][..])),
+			WasmExtBulkMemory => {
+				(ExecutorParams::default(), ExecutorParams::from(&[WasmExtBulkMemory][..]))
+			},
 		};
 
 		assert_ne!(ep1.prep_hash(), ep2.prep_hash());