feat: add image metadata loader with native LoRA Manager integration

Add Load Image Metadata (LoraManager) to extract reusable prompts,
model references, LoRA stacks, and sampling settings from images.

Prefer saved A1111-style parameters by default, with optional workflow
and subgraph sampler selection. Resolve local model and LoRA names,
report missing resources, and recover extraction failures with explicit
defaults and readable diagnostics.

Include parser, resource-resolution, and node regression tests, plus
usage documentation.

py/nodes/lora_loader.py

@@ -1,5 +1,6 @@
 import importlib
 import logging
+import os
 
 import comfy.sd  # pyright: ignore[reportMissingImports]
 import comfy.utils  # pyright: ignore[reportMissingImports]
@@ -37,7 +38,9 @@ def _collect_stack_entries(lora_stack):
 
     for lora_path, model_strength, clip_strength in lora_stack:
         lora_name = extract_lora_name(lora_path)
-        absolute_lora_path, trigger_words = get_lora_info_absolute(lora_name)
+        absolute_lora_path, trigger_words = get_lora_info_absolute(
+            lora_path if os.path.isabs(lora_path) else lora_name
+        )
         entries.append({
             "name": lora_name,
             "absolute_path": absolute_lora_path,