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

.rustfmt.toml

@@ -1,24 +1,31 @@
+# Pezkuwi SDK - Stable Rustfmt Configuration
+# Only stable features are used for long-term reliability
+
 # Basic
 edition = "2021"
 hard_tabs = true
 max_width = 100
 use_small_heuristics = "Max"
+
 # Imports
-imports_granularity = "Crate"
 reorder_imports = true
+
 # Consistency
 newline_style = "Unix"
+
 # Misc
 chain_width = 80
-spaces_around_ranges = false
-binop_separator = "Back"
-reorder_impl_items = false
 match_arm_leading_pipes = "Preserve"
-match_arm_blocks = false
 match_block_trailing_comma = true
-trailing_comma = "Vertical"
-trailing_semicolon = false
 use_field_init_shorthand = true
-# Format comments
-comment_width = 100
-wrap_comments = true
+
+# NOTE: The following nightly-only features were removed for stable compatibility:
+# - imports_granularity = "Crate"
+# - wrap_comments = true
+# - comment_width = 100
+# - reorder_impl_items = false
+# - spaces_around_ranges = false
+# - binop_separator = "Back"
+# - match_arm_blocks = false
+# - trailing_semicolon = false
+# - trailing_comma = "Vertical"