Add redact doc pages; update timeline docs to remove GPU references

- New: redact-about.php, redact-guide.php, redact-tech.php with full
  two-pass pipeline docs, regional rule sets, output format comparison
- New: translations/redact-{about,guide,tech}.php (en + no)
- redact.php: add About/Guide/How-it-works doc links
- timeline-guide.php: remove GPU/cuttlefish engine row
- timeline-tech.php: remove GPU row, replace fine-tuned LLM section
  with SSE streaming + DOCX export section, stat4 3→2 engines
- timeline-about.php: replace dbn-legal-agent spotlight with
  SSE/DOCX export highlight
- translations/timeline-{about,guide,tech}.php: remove all GPU/
  cuttlefish references across all 4 languages; add stream_* and
  export_* keys; fix upload copy (5 files → 1 file)

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

redact.php

@@ -8,6 +8,14 @@ require_once __DIR__ . '/includes/layout.php';
 ?>
                 <form id="toolForm" class="tool-form" novalidate>
 
+                    <div class="korr-doc-links">
+                        <a href="/redact-about.php" target="_blank">About this tool</a>
+                        <span aria-hidden="true">&middot;</span>
+                        <a href="/redact-guide.php" target="_blank">User guide</a>
+                        <span aria-hidden="true">&middot;</span>
+                        <a href="/redact-tech.php" target="_blank">How it works</a>
+                    </div>
+
                     <div class="lang-switcher" id="redactLangSwitcher" role="group" aria-label="UI language">
                         <button type="button" class="lang-btn is-active" data-lang="en">&#127468;&#127463; EN</button>
                         <button type="button" class="lang-btn" data-lang="no">&#127475;&#127476; NO</button>