feat: Add Compliance Wiki as internal admin knowledge base

Migration 040 with wiki_categories + wiki_articles tables, 10 seed
articles across 8 categories (DSGVO, Art. 9, AVV, HinSchG etc.).
Read-only FastAPI API, Next.js proxy, and two-column frontend with
full-text search.

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

admin-compliance/components/sdk/Sidebar/SDKSidebar.tsx

@@ -760,6 +760,19 @@ export function SDKSidebar({ collapsed = false, onCollapsedChange }: SDKSidebarP
             collapsed={collapsed}
             projectId={projectId}
           />
+          <AdditionalModuleItem
+            href="/sdk/wiki"
+            icon={
+              <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2}
+                  d="M12 6.253v13m0-13C10.832 5.477 9.246 5 7.5 5S4.168 5.477 3 6.253v13C4.168 18.477 5.754 18 7.5 18s3.332.477 4.5 1.253m0-13C13.168 5.477 14.754 5 16.5 5c1.747 0 3.332.477 4.5 1.253v13C19.832 18.477 18.247 18 16.5 18c-1.746 0-3.332.477-4.5 1.253" />
+              </svg>
+            }
+            label="Compliance Wiki"
+            isActive={pathname?.startsWith('/sdk/wiki')}
+            collapsed={collapsed}
+            projectId={projectId}
+          />
           <AdditionalModuleItem
             href="/sdk/api-docs"
             icon={