fix: pin plotly<6.0.0 to eliminate bdata binary encoding

Root cause: Plotly 6.x encodes numpy arrays as bdata (base64 binary)
at the to_dict() level - NOT during JSON serialization. This means
all orjson/json-engine patches were ineffective since bdata is baked
into the Figure data structure itself.

Solution: Pin plotly to 5.x which uses standard list format for arrays.
Also remove all orjson-related patches (no longer needed) and kaleido
(was irrelevant to the rendering issue).

app.py

@@ -27,14 +27,6 @@ import gradio as gr
 import sys
 from pathlib import Path
 
-# ── 屏蔽 Plotly 使用 orjson (必须在 import gradio 之后) ──
-# Gradio 在 utils.py:52 直接 import orjson，所以不能在导入前屏蔽。
-# 但 Gradio 导入后 orjson 已绑定到 gradio.utils.orjson，修改 sys.modules 不影响它。
-# Plotly 6.x 在每次序列化时通过 get_module("orjson") 动态查询 sys.modules，
-# 设为 None 后 get_module 返回 None，Plotly 回退到标准 json 引擎 (无 bdata)。
-sys.modules["orjson"] = None
-# ── End orjson block ──
-
 # 添加项目路径 (HuggingFace Spaces 兼容)
 DEMO_DIR = Path(__file__).parent
 sys.path.insert(0, str(DEMO_DIR))

requirements.txt

@@ -1,6 +1,5 @@
 gradio==4.44.1
-plotly>=5.18.0
-kaleido>=0.2.1
+plotly>=5.18.0,<6.0.0
 pandas>=2.0.0
 numpy>=1.24.0
 scikit-learn>=1.3.0