feat: add unified linting scripts and git hooks for code quality enforcement

- Introduced `lint` and `lint-fix` applications in `flake.nix` for unified linting of backend (Python) and frontend (TypeScript/Svelte) code.
- Added `scripts/lint.sh` for manual linting execution.
- Created `scripts/install-hooks.sh` to set up git hooks for automatic linting before commits and optional tests before pushes.
- Updated `README.md` with instructions for using the new linting features and git hooks.

backend/app/database/base.py

@@ -14,10 +14,10 @@ class Base(DeclarativeBase):
 
     # Generate __tablename__ automatically from class name
     @declared_attr.directive
-    def __tablename__(cls) -> str:
+    def __tablename__(self) -> str:
         """Generate table name from class name."""
         # Convert CamelCase to snake_case
-        name = cls.__name__
+        name = self.__name__
         return "".join(["_" + c.lower() if c.isupper() else c for c in name]).lstrip("_")
 
     # Common columns for all models
@@ -27,4 +27,3 @@ class Base(DeclarativeBase):
     def dict(self) -> dict[str, Any]:
         """Convert model to dictionary."""
         return {c.name: getattr(self, c.name) for c in self.__table__.columns}
-