Add camera calibration toolchain and armor pose solver

- capture_calib: capture calibration images (MindVision / USB) with a live
  quality gate (Laplacian sharpness, 3x3 coverage, board auto-detect)
- calibrate: batch intrinsics from calib_images/, writes configs/camera.yaml
- camera_calib: CameraCalib loader (intrinsics + distortion, cached
  undistort remap) and solvePose() via IPPE with a reprojection gate
- configs/camera.yaml: MV-SUA131GC intrinsics, RMS 0.483 px over 31 images,
  ruler-verified distance error < 2%
- xmake: three targets sharing an rm_deps rule, C++17
- gitignore: keep calibration photos/videos and generated
  compile_commands.json out of the repo

.vscode/compile_commands.json

@@ -1,11 +0,0 @@
-[
-{
-  "directory": "/home/mzxiang/opencv_project/27RM",
-  "arguments": ["/usr/bin/g++", "-c", "-m64", "-g", "-O0", "-std=c++11", "-I/home/mzxiang/opencv_project/27RM/inc", "-I/usr/local/include/opencv4", "-I/home/mzxiang/MindVisionSDK/include", "-o", "build/.objs/27RM/linux/x86_64/debug/src/main.cpp.o", "src/main.cpp"],
-  "file": "src/main.cpp"
-},
-{
-  "directory": "/home/mzxiang/opencv_project/27RM",
-  "arguments": ["/usr/bin/g++", "-c", "-m64", "-g", "-O0", "-std=c++11", "-I/home/mzxiang/opencv_project/27RM/inc", "-I/usr/local/include/opencv4", "-I/home/mzxiang/MindVisionSDK/include", "-o", "build/.objs/27RM/linux/x86_64/debug/src/camera_set.cpp.o", "src/camera_set.cpp"],
-  "file": "src/camera_set.cpp"
-}]