Linting/Formatting of models folder

Author: Snuffy2

app/models/__init__.py

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+"""MLX model implementations for different architectures."""

app/models/errors.py

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+"""Custom exceptions for the models module."""
+
+from __future__ import annotations
+
+
+class FluxModelError(Exception):
+    """Base exception for Flux model errors."""
+
+
+class ModelLoadError(FluxModelError):
+    """Raised when model loading fails."""
+
+    def __init__(self, message_or_path: str, original_exception: Exception | None = None) -> None:
+        if original_exception is not None:
+            self.model_path = message_or_path
+            self.original_exception = original_exception
+            super().__init__(f"Failed to load model from {message_or_path}: {original_exception}")
+        else:
+            super().__init__(message_or_path)
+
+
+class ModelGenerationError(FluxModelError):
+    """Raised when image generation fails."""
+
+
+class InvalidConfigurationError(FluxModelError):
+    """Raised when configuration is invalid."""