feat(settings): Codex Bağlama, on by default

Settings → Codex Bağlama runs the bundled bridge for an OpenAI Codex install on
the same computer: the IDE's models and combos appear in Codex and switching
models keeps the conversation. The IDE points Codex's openai_base_url at the
bridge only after the bridge answers, keeps it running across logins, and
removes every trace when the setting is turned off. A Codex that already uses
another base URL is left untouched.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HRDGW1LiKcDUZYUdKBoWYW

apps/desktop/electron/preload.ts

@@ -290,6 +290,16 @@ contextBridge.exposeInMainWorld('hermesDesktop', {
     // Opens the "Telefon bağlantısı" window (electron/mobile-host.mjs).
     open: () => ipcRenderer.invoke('aiturk:mobile:open')
   },
+  // "Codex Bağlama" (electron/codex-link.ts). Windows only: absent elsewhere,
+  // so Settings does not offer a page that cannot do anything.
+  ...(process.platform === 'win32'
+    ? {
+        codexLink: {
+          get: () => ipcRenderer.invoke('aiturk:codex-link:get'),
+          set: patch => ipcRenderer.invoke('aiturk:codex-link:set', patch)
+        }
+      }
+    : {}),
   mcpOauth: {
     // One-shot loopback listener for MCP OAuth against remote backends: bind
     // on this machine, hand redirectUri to mcp.servers.oauth.start, then wait