Add local availability check for Civitai model versions; enhance download manager UI to indicate local status

py/services/lora_hash_index.py

@@ -0,0 +1,48 @@
+from typing import Dict, Optional
+import logging
+from dataclasses import dataclass
+
+logger = logging.getLogger(__name__)
+
+@dataclass
+class LoraHashIndex:
+    """Index for mapping LoRA file hashes to their file paths"""
+    
+    def __init__(self):
+        self._hash_to_path: Dict[str, str] = {}
+        
+    def add_entry(self, sha256: str, file_path: str) -> None:
+        """Add or update a hash -> path mapping"""
+        if not sha256 or not file_path:
+            return
+        self._hash_to_path[sha256] = file_path
+        
+    def remove_entry(self, sha256: str) -> None:
+        """Remove a hash entry"""
+        self._hash_to_path.pop(sha256, None)
+        
+    def remove_by_path(self, file_path: str) -> None:
+        """Remove entry by file path"""
+        for sha256, path in list(self._hash_to_path.items()):
+            if path == file_path:
+                del self._hash_to_path[sha256]
+                break
+                
+    def get_path(self, sha256: str) -> Optional[str]:
+        """Get file path for a given hash"""
+        return self._hash_to_path.get(sha256)
+        
+    def get_hash(self, file_path: str) -> Optional[str]:
+        """Get hash for a given file path"""
+        for sha256, path in self._hash_to_path.items():
+            if path == file_path:
+                return sha256
+        return None
+        
+    def has_hash(self, sha256: str) -> bool:
+        """Check if hash exists in index"""
+        return sha256 in self._hash_to_path
+        
+    def clear(self) -> None:
+        """Clear all entries"""
+        self._hash_to_path.clear()