refactor: #85 T4 extrait le domaine backups vers backend/routers + sse partage (comportement inchange)

backend/schemas.py

@@ -188,6 +188,32 @@ class BackupsAutoResponse(BaseModel):
     since_hours: int | float = Field(description="Look-back window in hours")
 
 
+class DiffResponse(BaseModel):
+    """Response containing a unified diff between two file versions (#85 — extrait de backend.main, inchangé)."""
+
+    vault: str = Field(description="Vault name")
+    path: str = Field(description="Relative file path")
+    version: int = Field(description="Backup version timestamp (left/old side)")
+    compare_with: int | None = Field(default=None, description="Other backup version or null for current file (right/new side)")
+    diff: str = Field(description="Unified diff (empty if no changes)")
+
+
+class RestoreRequest(BaseModel):
+    """Request to restore a file from a backup (#85 — extrait de backend.main, inchangé)."""
+
+    version: int = Field(description="Timestamp of the backup version to restore")
+
+
+class RestoreResponse(BaseModel):
+    """Response after restoring a file from backup (#85 — extrait de backend.main, inchangé)."""
+
+    success: bool = Field(description="Whether restore succeeded")
+    vault: str = Field(description="Vault name")
+    path: str = Field(description="Relative file path")
+    restored_from: int = Field(description="Timestamp of the backup used")
+    current_backed_up: int | None = Field(default=None, description="Timestamp of the backup created from the current version before restore, if any")
+
+
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