fix: resolve CI linting failures

- Removed unused imports (pathlib.Path, Schema, EnvVar, Optional)
- Fixed f-strings without placeholders in generator.py and validators.py
- Removed unused variables in generator.py
- Updated CI workflow to use correct project name (envschema)

envschema/generator.py

@@ -25,13 +25,10 @@ def generate_env_example(schema: Schema, include_descriptions: bool = True) -> s
             lines.append(f"# {var.description}")
 
         if var.required:
-            lines.append(f"# REQUIRED")
+            lines.append("# REQUIRED")
         elif var.default is not None:
             lines.append(f"# Default: {var.default}")
 
-        default_part = f"# {var.default}" if var.default else ""
-        type_part = f"[{var.type.value}]"
-
         if var.required:
             lines.append(f"{var.name}=")
         elif var.default is not None: