Support re-import for recipes without a source URL

Recipes imported by drag & drop / file-picker record no source_path and
were rejected by re-import. Fall back to the recipe's own saved image,
which still carries the original embedded generation metadata.

Re-import now re-parses that original metadata instead of the appended
recipe JSON block, so parser upgrades produce fresh results. The
already-optimized preview image is kept verbatim: only its WebP EXIF
chunk is rewritten in place to replace the recipe metadata block, and
the recipe JSON is rewritten with the new analysis plus carried-over
user edits.

py/services/recipes/analysis_service.py

@@ -368,6 +368,7 @@ class RecipeAnalysisService:
         *,
         file_path: str | None,
         recipe_scanner,
+        ignore_recipe_metadata: bool = False,
     ) -> AnalysisResult:
         """Analyze a file already present on disk."""
 
@@ -389,6 +390,22 @@ class RecipeAnalysisService:
             }
             return result
 
+        if ignore_recipe_metadata:
+            # Re-import: re-parse the original embedded generation metadata
+            # instead of the recipe JSON block LoRA Manager appended on save.
+            from ...recipes.parsers.recipe_format import strip_recipe_metadata
+
+            metadata = strip_recipe_metadata(metadata)
+            if not metadata:
+                result = self._metadata_not_found_response(normalized_path)
+                result.payload["diagnostics"] = {
+                    "channel": "local",
+                    "exif_present": True,
+                    "ignore_recipe_metadata": True,
+                    "reason": "only_recipe_metadata",
+                }
+                return result
+
         result = await self._parse_metadata(
             metadata,
             recipe_scanner=recipe_scanner,