feat: Implement upscale functionality with ONNX models

- Added upscale operator to handle image upscaling by 4x using AI models.
- Introduced new jobs for upscale processing in the server, including debug and standard upscale jobs.
- Created a new ONNX model handler for upscale operations, supporting tiled inference and resource management.
- Updated tests to cover new upscale functionality, including input validation and output verification.
- Added documentation for the upscale feature, detailing usage and model options.

src/anyimage/operators/balloon/operator.py

@@ -151,24 +151,6 @@ def data_name_matches(name, base_name):
     return suffix != name and suffix.isdigit()
 
 
-def material_uses_balloon_texture(material, color_name):
-    node_tree = getattr(material, "node_tree", None)
-    if node_tree is None:
-        return False
-    has_texture_layer = any(
-        getattr(node, "type", None) == "GROUP"
-        and getattr(getattr(node, "node_tree", None), "name", None)
-        == TEXTURE_MATERIAL_NODE_GROUP_NAME
-        for node in node_tree.nodes
-    )
-    has_color_image = any(
-        getattr(node, "type", None) == "TEX_IMAGE"
-        and getattr(node, "image", None) is not None
-        and data_name_matches(node.image.name, color_name)
-        for node in node_tree.nodes
-    )
-    return has_texture_layer and has_color_image
-
 
 def marked_balloon_material(source_image, normal_required=False):
     return next(
@@ -194,30 +176,8 @@ def mark_balloon_material(material, source_image, normal_image=None):
         material[BALLOON_NORMAL_IMAGE_PROPERTY] = normal_image
 
 
-def reusable_balloon_material(
-    material_name,
-    color_name,
-    source_image=None,
-    normal_required=False,
-):
-    marked = (
-        marked_balloon_material(source_image, normal_required)
-        if source_image is not None
-        else None
-    )
-    if marked is not None:
-        return marked
-    if normal_required:
-        return None
-    return next(
-        (
-            material
-            for material in bpy.data.materials
-            if data_name_matches(material.name, material_name)
-            and material_uses_balloon_texture(material, color_name)
-        ),
-        None,
-    )
+def reusable_balloon_material(source_image, normal_required=False):
+    return marked_balloon_material(source_image, normal_required)
 
 
 def load_balloon_normal_image(path, source_object):
@@ -331,8 +291,6 @@ def extract_balloon_object(
     uses_normal = normal_path is not None
     material = (
         reusable_balloon_material(
-            material_name,
-            color_name,
             image,
             normal_required=uses_normal,
         )