add plugin camera desktop

plugins/camera_desktop/ci/cp936_repro.cpp

@@ -0,0 +1,25 @@
+// Synthetic CP936-reproduction file for CI.
+//
+// This file deliberately contains every non-ASCII character that appears in
+// windows/*.cpp and windows/*.h, so that compiling it with
+//   cl /c /WX /source-charset:.936 /execution-charset:.936
+// reproduces the exact C4819 / C2220 failure that users see on Simplified
+// Chinese Windows hosts (where GetACP() == 936 / GBK).
+//
+// DO NOT add a BOM to this file. With a BOM, MSVC auto-detects UTF-8 and
+// ignores /source-charset:.936, which would defeat the test.
+//
+// If you add a new non-ASCII character anywhere under windows/, the CI step
+// `ci/check_unicode_inventory.py` will fail until you add that character
+// here. Keep the inventory below in sync.
+//
+// Covered characters (also listed explicitly so a byte-level grep for the
+// UTF-8 sequences finds them here):
+//   U+2026 HORIZONTAL ELLIPSIS          …
+//   U+2192 RIGHTWARDS ARROW             →
+//   U+2194 LEFT RIGHT ARROW             ↔
+//   U+2264 LESS-THAN OR EQUAL TO        ≤
+//   U+2500 BOX DRAWINGS LIGHT HORIZONTAL ─
+//
+// No code needed: /c (compile only) is sufficient to trigger C4819 on the
+// comment bytes above.