feat(arm): 建模代码拆成每件一模块，查看器新增工程图与装配步骤页

- src/parts/p01~p09 + src/part_tools.py：几何、件号/配色/说明与装配帧归属随各自件文件走，arm_model.py 只留装配流水线并对件级符号做只读转发；P04_CH / P07_CH / P06_WIN_XZ / FENCE_OPEN_CUT 这类开关必须写所在件文件，写 arm_model.X 不生效，A/B 判据为翻转后体积变化
- docs/sheet_{exploded,front,side,joint}.svg + draw_sheet.py：四张工程图进查看器页签，支持图层开关、件号高亮与 BOM/3D 联动跳转
- travel/travel_detail/collide/bom/screws 随最新几何重生成；补线束走线、拆卸定位点与 P04 承压面剖切验证图
- .gitignore 排除 .bak/ 与 *.bak_* 源码快照（旧版本 git 历史里已有）

src/shot.py

@@ -28,6 +28,13 @@ if not EDGE:
 VIEWS = {
     "01_iso": "?cam=iso",
     "zoom_user": "?cam=iso&az=-0.9&po=1.15&rd=470&tx=30&ty=320&tz=-80&xray=0",
+    "user_harness_view": "?az=-1.85&po=1.32&rd=430&tx=0&ty=330&tz=-115&xray=0",
+    "user_harness_zoom": "?az=-1.85&po=1.32&rd=280&tx=-5&ty=360&tz=-115&xray=0",
+    "user_m1_rear": "?az=-1.25&po=1.35&rd=350&tx=-70&ty=570&tz=-128&xray=0",
+    "user_m1_exact": "?az=-1.5708&po=1.5708&rd=260&tx=0&ty=610&tz=-128&xray=0",
+    "user_m1_bypass_oblique": "?az=-1.0&po=1.15&rd=300&tx=-40&ty=580&tz=-140&xray=0",
+    "user_smooth_harness": "?az=1.50&po=1.45&rd=340&tx=-15&ty=560&tz=-128&xray=0",
+    "user_contour_harness": "?az=1.5708&po=1.50&rd=360&tx=-15&ty=320&tz=-128&xray=0",
     "02_front": "?cam=front",
     "03_side": "?cam=side",
     "04_top": "?cam=top",
@@ -118,6 +125,15 @@ VIEWS = {
     "harness_p04_p05_xray": "?az=0.8&po=1.35&rd=280&tx=25&ty=470&tz=-128&alpha=0.35&xray=1",
     "harness_p06_window": "?az=-0.65&po=1.25&rd=240&tx=25&ty=355&tz=-128&xray=0",
     "harness_xray_full": "?cam=iso&xray=1",
+    # 扎带拱桥核验：沿 ±Y 正视肩部，确认三个拱桥各自露出多少、线束是否压在桥上
+    "tie_probe_negY": "?az=1.5708&po=1.5708&rd=460&tx=-30&ty=590&tz=-128&xray=0",
+    "tie_probe_posY": "?az=-1.5708&po=1.5708&rd=460&tx=-30&ty=590&tz=-128&xray=0",
+    "tie_after_negY": "?az=1.5708&po=1.5708&rd=300&tx=-25&ty=600&tz=-128&xray=0",
+    "tie_after_oblique": "?az=2.05&po=1.30&rd=330&tx=-25&ty=600&tz=-128&xray=0",
+    "tie_after_close": "?az=1.90&po=1.50&rd=180&tx=-25&ty=605&tz=-100&xray=0",
+    # P06/P07 −X 侧线束走廊：从 −X、−Y 斜看（纯 −X 会被蓝色立柱挡住）
+    "tie_after_p0607": "?az=2.35&po=1.5708&rd=300&tx=0&ty=290&tz=-102.5&xray=0",
+    "tie_after_p0607_obl": "?az=2.60&po=1.35&rd=260&tx=-5&ty=290&tz=-110&xray=0",
 }
 os.makedirs(SHOTS, exist_ok=True)
 want = sys.argv[1:] or list(VIEWS)