[Bug Fix] Add partial rotary factor support for Phi-4 and upgrade to transformers v4.50.0 (#3984)

Co-authored-by: Chayenne <zhaochen20@outlook.com>

python/sglang/srt/configs/__init__.py

@@ -2,21 +2,12 @@ from sglang.srt.configs.chatglm import ChatGLMConfig
 from sglang.srt.configs.dbrx import DbrxConfig
 from sglang.srt.configs.deepseekvl2 import DeepseekVL2Config
 from sglang.srt.configs.exaone import ExaoneConfig
-from sglang.srt.configs.gemma3 import Gemma3Config, Gemma3TextConfig
 from sglang.srt.configs.janus_pro import MultiModalityConfig
-from sglang.srt.configs.qwen2_5_vl_config import (
-    Qwen2_5_VLConfig,
-    Qwen2_5_VLVisionConfig,
-)
 
 __all__ = [
     "ExaoneConfig",
     "ChatGLMConfig",
     "DbrxConfig",
     "DeepseekVL2Config",
-    "Qwen2_5_VLConfig",
-    "Qwen2_5_VLVisionConfig",
     "MultiModalityConfig",
-    "Gemma3Config",
-    "Gemma3TextConfig",
 ]