feat(codex-link): AITURK work routing setting and beta.40

- Default routing rule (user decision, 15 Oct 2026): repeating/scheduled work goes to the AITURK IDE bot as a cron job; coding stays in Codex (itself or its subagents); 'Codex' or 'sen yap' keeps everything in Codex.
- Settings > Codex Bağlama: choice (recommended / send large work / never / custom text) with a text box and restore-default; written to bridge.json aiturk_hat.
- Bridge re-reads aiturk_hat when bridge.json changes: no restart. IDE apply keeps aiturk_hat instead of wiping it.
- Bridge version 20, IDE 1.0.0-beta.40. Jev untouched.

apps/desktop/electron/codex-link-config.ts

@@ -27,7 +27,7 @@ export const CODEX_LINK_REFRESH_URL = `${CODEX_LINK_ORIGIN}/aiturk/codex-baglama
 export const CODEX_LINK_MARKER = '# AITURK IDE Codex Baglama'
 // Must equal SURUM in assets/codex-bridge/bridge.py; a running bridge that reports
 // another version is restarted so an updated IDE never keeps an old bridge alive.
-export const CODEX_BRIDGE_VERSION = '19'
+export const CODEX_BRIDGE_VERSION = '20'
 export const CODEX_LINK_LINE = `openai_base_url = "${CODEX_LINK_ORIGIN}/backend-api/codex"  ${CODEX_LINK_MARKER}`
 
 export const CODEX_LINK_RUN_KEY = 'HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run'
@@ -352,8 +352,21 @@ export function codexBridgeConfig() {
   }
 }
 
-export function serializeCodexBridgeConfig(): string {
-  return `${JSON.stringify(codexBridgeConfig(), null, 2)}\n`
+/** Keeps the user's own choices (Settings → AITURK iş hattı) across the rewrite. */
+export function serializeCodexBridgeConfig(previous?: null | string): string {
+  const config: Record<string, unknown> = codexBridgeConfig()
+
+  try {
+    const old = previous ? JSON.parse(previous) : null
+
+    if (old && typeof old === 'object' && old.aiturk_hat && typeof old.aiturk_hat === 'object') {
+      config.aiturk_hat = old.aiturk_hat
+    }
+  } catch {
+    // An unreadable file has nothing worth keeping.
+  }
+
+  return `${JSON.stringify(config, null, 2)}\n`
 }
 
 // ── Bridge command line ─────────────────────────────────────────────────────