fix: correct workflow diagram image path for SPA routing

The SPA injects HTML via innerHTML, so relative image paths resolve
from the page root, not from the docs/ directory. Use docs/ prefix.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: raifdmueller

docs/spec-driven-workflow.adoc

@@ -78,7 +78,7 @@ Short transmissions with error correction are far more reliable than one long, u
 
 == Workflow Overview
 
-image::workflow-diagram.svg[Workflow Overview,width=1100]
+image::docs/workflow-diagram.svg[Workflow Overview,width=1100]
 
 == Cross-Cutting Concerns
 

docs/spec-driven-workflow.de.adoc

@@ -80,7 +80,7 @@ Kurze Übertragungen mit Fehlerkorrektur sind weit zuverlässiger als eine lange
 
 == Workflow-Übersicht
 
-image::workflow-diagram.svg[Workflow-Übersicht,width=1100]
+image::docs/workflow-diagram.svg[Workflow-Übersicht,width=1100]
 
 == Querschnittsthemen