vision: ricetta DXF riapribile, immagine salvata, rotte source e files, soglia segue la quota (Refs #105)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jbf7qKuxsnAVjxthRy7dnB

src/backend/api/routers/vision.py

@@ -8,6 +8,7 @@ import base64
 import binascii
 import io
 import json
+import mimetypes
 from typing import Literal
 
 from fastapi.responses import FileResponse
@@ -447,8 +448,50 @@ async def create_dxf_compare_recipe(
     placed, errors = vision_service.match_recipe_files(body["graph"], uploads)
     if errors:
         raise _422(errors)
+    # #105: l'immagine di riferimento resta nella cartella (non e' in meta, quindi
+    # /validate e l'esecuzione la ignorano) e il wizard puo' riaprirla; entra nel digest.
+    placed[f"riferimento.{_IMAGE_EXTENSIONS.get(image.content_type, 'png')}"] = image_bytes
     recipe_dir, check = await _store_validate_assign(task, body["graph"], placed)
     await vision_service.ensure_points_quote(db, task, min_points_pct)
     await db.commit()
     response.update(saved=True, recipe_dir=recipe_dir, outputs=check["outputs"])
     return response
+
+
+@router.get("/tasks/{task_id}/recipe/dxf-compare/source")
+async def get_dxf_compare_source(
+    task_id: int,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(require_maker),
+) -> dict:
+    """#105: i parametri della ricetta fatta con «Crea ricetta da DXF», per modificarla.
+
+    404 se il task non ha una ricetta del wizard (nessuna, o caricata a mano).
+    """
+    task = await _task_or_404(db, task_id)
+    source = vision_service.dxf_compare_source(task.vision_json, task.vision_recipe_dir)
+    if source is None:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="nessuna ricetta da DXF su questo task",
+        )
+    return source
+
+
+@router.get("/tasks/{task_id}/recipe/files/{path:path}")
+async def get_recipe_file(
+    task_id: int,
+    path: str,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(require_maker),
+) -> FileResponse:
+    """#105: un file della cartella ricetta del task (DXF, immagine di riferimento).
+
+    Percorso non sicuro, file assente o task senza ricetta: sempre 404.
+    """
+    task = await _task_or_404(db, task_id)
+    target = vision_service.recipe_file_path(task.vision_recipe_dir, path)
+    if target is None:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="file not found")
+    media_type = mimetypes.guess_type(target.name)[0] or "application/octet-stream"
+    return FileResponse(target, media_type=media_type)