chore: rename H7CAD to Open CAD Studio

Joining the OpenAEC Foundation (open-aec.com). Crate/struct become
OpenCADStudio, user-facing strings use the spaced "Open CAD Studio"
form, repo URLs point to HakanSeven12/open-cad-studio. Logo (window
icon + assets/logo.svg) redrawn with OCS initials. Drop examples/
binaries — unused.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

packaging/Info.plist

@@ -5,17 +5,17 @@
     <key>CFBundleDevelopmentRegion</key>
     <string>en</string>
     <key>CFBundleDisplayName</key>
-    <string>H7CAD</string>
+    <string>Open CAD Studio</string>
     <key>CFBundleExecutable</key>
-    <string>H7CAD</string>
+    <string>OpenCADStudio</string>
     <key>CFBundleIconFile</key>
     <string>AppIcon</string>
     <key>CFBundleIdentifier</key>
-    <string>io.github.HakanSeven12.H7CAD</string>
+    <string>io.github.HakanSeven12.OpenCadStudio</string>
     <key>CFBundleInfoDictionaryVersion</key>
     <string>6.0</string>
     <key>CFBundleName</key>
-    <string>H7CAD</string>
+    <string>Open CAD Studio</string>
     <key>CFBundlePackageType</key>
     <string>APPL</string>
     <key>CFBundleShortVersionString</key>