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>

assets/logo.svg

@@ -29,60 +29,26 @@
      inkscape:window-y="0"
      inkscape:window-maximized="1"
      inkscape:current-layer="svg8" />
-  <!-- Arka plan -->
+  <!-- Background -->
   <rect
      width="48"
      height="48"
      rx="6"
      fill="#B03020"
      id="rect1" />
-  <!-- İnce grid çizgileri (CAD atmosferi) -->
-  <!-- H harfi -->
-  <line
-     x1="7"
-     y1="10"
-     x2="7"
-     y2="38"
-     stroke="white"
-     stroke-width="3.5"
-     stroke-linecap="round"
-     id="line3" />
-  <line
-     x1="19"
-     y1="10"
-     x2="19"
-     y2="38"
-     stroke="white"
-     stroke-width="3.5"
-     stroke-linecap="round"
-     id="line4" />
-  <line
-     x1="7"
-     y1="24"
-     x2="19"
-     y2="24"
-     stroke="white"
-     stroke-width="3.5"
-     stroke-linecap="round"
-     id="line5" />
-  <!-- 7 rakamı -->
-  <line
-     x1="26"
-     y1="10"
-     x2="41"
-     y2="10"
-     stroke="white"
-     stroke-width="3.5"
-     stroke-linecap="round"
-     id="line6" />
-  <line
-     x1="41"
-     y1="10"
-     x2="30"
-     y2="38"
-     stroke="white"
-     stroke-width="3.5"
-     stroke-linecap="round"
-     id="line7" />
-  <!-- 7 üzerindeki orta çizgi (stil için) -->
+  <!-- O -->
+  <line x1="5"  y1="10" x2="13" y2="10" stroke="white" stroke-width="3" stroke-linecap="round" id="o-top" />
+  <line x1="5"  y1="38" x2="13" y2="38" stroke="white" stroke-width="3" stroke-linecap="round" id="o-bot" />
+  <line x1="5"  y1="10" x2="5"  y2="38" stroke="white" stroke-width="3" stroke-linecap="round" id="o-left" />
+  <line x1="13" y1="10" x2="13" y2="38" stroke="white" stroke-width="3" stroke-linecap="round" id="o-right" />
+  <!-- C -->
+  <line x1="18" y1="10" x2="26" y2="10" stroke="white" stroke-width="3" stroke-linecap="round" id="c-top" />
+  <line x1="18" y1="38" x2="26" y2="38" stroke="white" stroke-width="3" stroke-linecap="round" id="c-bot" />
+  <line x1="18" y1="10" x2="18" y2="38" stroke="white" stroke-width="3" stroke-linecap="round" id="c-left" />
+  <!-- S -->
+  <line x1="31" y1="10" x2="39" y2="10" stroke="white" stroke-width="3" stroke-linecap="round" id="s-top" />
+  <line x1="31" y1="10" x2="31" y2="24" stroke="white" stroke-width="3" stroke-linecap="round" id="s-tl" />
+  <line x1="31" y1="24" x2="39" y2="24" stroke="white" stroke-width="3" stroke-linecap="round" id="s-mid" />
+  <line x1="39" y1="24" x2="39" y2="38" stroke="white" stroke-width="3" stroke-linecap="round" id="s-br" />
+  <line x1="31" y1="38" x2="39" y2="38" stroke="white" stroke-width="3" stroke-linecap="round" id="s-bot" />
 </svg>