Initialize voicebox project with backend, frontend, and Tauri setup. Added configuration files, dependencies, and basic structure for components, hooks, and utilities. Included README and setup documentation for guidance.

backend/utils/validation.py

@@ -0,0 +1,63 @@
+"""
+Input validation utilities.
+"""
+
+from typing import Tuple, Optional
+from pathlib import Path
+
+
+def validate_text(text: str, max_length: int = 5000) -> Tuple[bool, Optional[str]]:
+    """
+    Validate text input.
+    
+    Args:
+        text: Text to validate
+        max_length: Maximum length
+        
+    Returns:
+        Tuple of (is_valid, error_message)
+    """
+    if not text or not text.strip():
+        return False, "Text cannot be empty"
+    
+    if len(text) > max_length:
+        return False, f"Text too long (maximum {max_length} characters)"
+    
+    return True, None
+
+
+def validate_language(language: str) -> Tuple[bool, Optional[str]]:
+    """
+    Validate language code.
+    
+    Args:
+        language: Language code
+        
+    Returns:
+        Tuple of (is_valid, error_message)
+    """
+    valid_languages = ["en", "zh"]
+    if language not in valid_languages:
+        return False, f"Invalid language (must be one of: {', '.join(valid_languages)})"
+    
+    return True, None
+
+
+def validate_file_path(path: str) -> Tuple[bool, Optional[str]]:
+    """
+    Validate file path exists.
+    
+    Args:
+        path: File path
+        
+    Returns:
+        Tuple of (is_valid, error_message)
+    """
+    file_path = Path(path)
+    if not file_path.exists():
+        return False, f"File not found: {path}"
+    
+    if not file_path.is_file():
+        return False, f"Path is not a file: {path}"
+    
+    return True, None