docs: 更新BOM清单与渲染图，适配200mm分段式立柱和防呆底座设计

src/arm_build.py

@@ -620,7 +620,7 @@ def export(JS):
                 print(f"  [文件导出 {done_exp}/{total_exp}] {p['name']}.step / .stl 导出完成 ({dt:.2f}s) ✓", flush=True)
         return p["name"]
 
-    workers = min(8, os.cpu_count() or 4)
+    workers = 1
     with ThreadPoolExecutor(max_workers=workers) as ex:
         list(ex.map(export_one_part, PARTS))
 
@@ -686,6 +686,11 @@ def collide():
         ("P06_大臂骨架", "M4_J4"), ("P07_小臂骨架", "M4_J4"),
         ("P07_小臂骨架", "M5_J5"), ("P08_腕偏转座", "M5_J5"),
         ("P08_腕偏转座", "M6_J6"), ("P09_工具法兰", "M6_J6"),
+        ("P01_A_立柱下段", "P01_B_立柱中段"), ("P01_B_立柱中段", "P01_C_立柱上段"),
+        ("P01_A_立柱下段", "P02_Center_底座中核心"),
+        ("P02_Center_底座中核心", "P02_Front_前向防翻力臂"),
+        ("P02_Center_底座中核心", "P02_Rear_后向防翻力臂"),
+        ("P01_C_立柱上段", "P03_肩吊臂"),
     }
     for i in range(len(ps)):
         for j in range(i + 1, len(ps)):