Add Transcribe docs (about/guide/tech) + refresh Redact docs

- New: transcribe-about.php, transcribe-guide.php, transcribe-tech.php
  with full en/no/uk/pl translations (3-engine cascade, diarization, vocab)
- New: translations/transcribe-about|guide|tech.php (4-lang strings)
- New: scripts/translate-pages.php (Azure gpt-4o CLI translation helper)
- Add korr-doc-links nav to transcribe.php
- Refresh redact-about|guide|tech.php — point to assets/images/redact/
- Fix all "never written to disk" wording in redact translations
- Add Min Sak/corpus save workflow to redact guide and tech privacy section
- redact.php upload hint: correct in-memory wording

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

redact-about.php

@@ -67,7 +67,7 @@ $t   = $_pt[$uiLang] ?? $_pt['en'];
 </nav>
 
 <!-- Hero -->
-<section class="kdoc-hero" style="background: linear-gradient(rgba(0,20,60,0.82),rgba(0,20,60,0.88)), url('assets/images/timeline/hero-marketing.png') center/cover no-repeat;">
+<section class="kdoc-hero" style="background: linear-gradient(rgba(0,20,60,0.82),rgba(0,20,60,0.88)), url('assets/images/redact/hero-marketing.png') center/cover no-repeat;">
     <div class="kdoc-hero__inner">
         <p class="kdoc-hero__kicker"><?= htmlspecialchars($t['hero_kicker']) ?></p>
         <h1 class="kdoc-hero__title"><?= htmlspecialchars($t['hero_title']) ?></h1>