Support JoyAI-Image-Edit (#1393)

* auto intergrate joyimage model

* joyimage pipeline

* train

* ready

* styling

* joyai-image docs

* update readme

* pr review

diffsynth/utils/state_dict_converters/joyai_image_text_encoder.py

@@ -0,0 +1,20 @@
+def JoyAIImageTextEncoderStateDictConverter(state_dict):
+    """Convert HuggingFace Qwen3VL checkpoint keys to DiffSynth wrapper keys.
+
+    Mapping (checkpoint -> wrapper):
+    - lm_head.weight -> model.lm_head.weight
+    - model.language_model.* -> model.model.language_model.*
+    - model.visual.* -> model.model.visual.*
+    """
+    state_dict_ = {}
+    for key in state_dict:
+        if key == "lm_head.weight":
+            new_key = "model.lm_head.weight"
+        elif key.startswith("model.language_model."):
+            new_key = "model.model." + key[len("model."):]
+        elif key.startswith("model.visual."):
+            new_key = "model.model." + key[len("model."):]
+        else:
+            new_key = key
+        state_dict_[new_key] = state_dict[key]
+    return state_dict_