feat: 新增螺丝网格生成与强度校核功能，重建模型数据与查看器，补充定位图与BOM文档

新增 screw_mesh.py 螺丝网格划分模块与 strength_check.py 强度校核逻辑，arm_model.py 同步集成网格生成与校核流程；viewer_tpl.html、web/index.html 与 web/机器人手臂3D查看器.html 更新查看器模板以支持新数据展示；docs/bom.json 与 docs/travel_detail.json 调整 BOM 清单与行程参数；docs/print_settings.md 新增打印设置说明，新增螺丝采购清单 HTML；补充大量定位图与验证截图。

src/arm_build.py

@@ -443,17 +443,17 @@ def collide():
     ps = [p for p in PARTS if p["vol"] > 1.0]
     pairs = []
     MOUNT_PAIRS = {
-        ("P03_肩吊臂", "M1_J1"), ("P04_肩叉", "M1_J1"),
-        ("P04_肩叉", "M2_J2"), ("P05_大臂旋转座", "M2_J2"),
-        ("P05_大臂旋转座", "M3_J3"), ("P06_大臂骨架", "M3_J3"),
-        ("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"),
+        ("P03_肩吊臂_螺旋体35%_墙5底5_竖打", "M1_J1"), ("P04_肩叉_螺旋体30%_墙5底5_竖打", "M1_J1"),
+        ("P04_肩叉_螺旋体30%_墙5底5_竖打", "M2_J2"), ("P05_大臂旋转座_螺旋体30%_墙4底5_竖打", "M2_J2"),
+        ("P05_大臂旋转座_螺旋体30%_墙4底5_竖打", "M3_J3"), ("P06_大臂骨架_螺旋体25%_墙4底5_竖打", "M3_J3"),
+        ("P06_大臂骨架_螺旋体25%_墙4底5_竖打", "M4_J4"), ("P07_小臂骨架_螺旋体30%_墙5底5_竖打", "M4_J4"),
+        ("P07_小臂骨架_螺旋体30%_墙5底5_竖打", "M5_J5"), ("P08_腕偏转座_螺旋体25%_墙4底5_竖打", "M5_J5"),
+        ("P08_腕偏转座_螺旋体25%_墙4底5_竖打", "M6_J6"), ("P09_工具法兰_螺旋体100%_墙4底5_竖打", "M6_J6"),
+        ("P01_A_立柱下段_三角形30%_墙4底5_竖打", "P01_B_立柱中段_三角形30%_墙4底5_竖打"), ("P01_B_立柱中段_三角形30%_墙4底5_竖打", "P01_C_立柱上段_三角形30%_墙4底5_竖打"),
+        ("P01_A_立柱下段_三角形30%_墙4底5_竖打", "P02_Center_底座中核心_螺旋体30%_墙5底6_平打"),
+        ("P02_Center_底座中核心_螺旋体30%_墙5底6_平打", "P02_Front_前向防翻力臂_螺旋体30%_墙4底5_平打"),
+        ("P02_Center_底座中核心_螺旋体30%_墙5底6_平打", "P02_Rear_后向防翻力臂_螺旋体30%_墙4底5_平打"),
+        ("P01_C_立柱上段_三角形30%_墙4底5_竖打", "P03_肩吊臂_螺旋体35%_墙5底5_竖打"),
     }
     for i in range(len(ps)):
         for j in range(i + 1, len(ps)):