ci: add comprehensive formatting and linting setup

- Add formatting commands to justfile (format, fmt_check, clippy_check, fc)
- Create GitHub Actions workflows for automated fmt and clippy checks
- Fix existing clippy warnings in macro code
- Ensure CI enforcement of code quality standards

This brings native_model in line with native_db's robust formatting and linting approach.

libraries/native_model/native_model_macro/src/lib.rs

@@ -27,7 +27,7 @@ pub(crate) struct ModelAttributes {
     pub(crate) try_from: Option<(Path, Path)>,
 }
 
-impl        Default for ModelAttributes {
+impl Default for ModelAttributes {
     fn default() -> Self {
         ModelAttributes {
             id: None,
@@ -57,10 +57,7 @@ impl ModelAttributes {
                 fields.next().unwrap().clone(),
             ));
         } else {
-            panic!(
-                "Unknown attribute: {}",
-                meta.path.get_ident().unwrap().to_string()
-            );
+            panic!("Unknown attribute: {}", meta.path.get_ident().unwrap());
         }
         Ok(())
     }

libraries/native_model/native_model_macro/src/method/decode_body.rs

@@ -19,5 +19,5 @@ pub(crate) fn generate_native_model_decode_body(attrs: &ModelAttributes) -> Toke
         }
     };
 
-    gen.into()
+    gen
 }

libraries/native_model/native_model_macro/src/method/encode_body.rs

@@ -14,5 +14,5 @@ pub(crate) fn generate_native_model_encode_body(attrs: &ModelAttributes) -> Toke
         }
     };
 
-    gen.into()
+    gen
 }