feat(ui): Master Controls Browser — 13.5K MCs with member drill-down

- New page /sdk/master-controls with sortable, searchable MC list
- Click MC → expandable detail panel with atomic controls
- Shows L1 token, L2 subtopic, phase, severity, regulation source
- API proxy via pg directly to compliance.master_controls
- Sidebar entry added

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

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

@@ -38,6 +38,21 @@ export function SidebarModuleList({ collapsed, projectId, pendingCRCount }: Side
         <AdditionalModuleItem href="/sdk/email-templates" icon={<svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3 8l7.89 5.26a2 2 0 002.22 0L21 8M5 19h14a2 2 0 002-2V7a2 2 0 00-2-2H5a2 2 0 00-2 2v10a2 2 0 002 2z" /></svg>} label="E-Mail-Templates" isActive={pathname === '/sdk/email-templates'} collapsed={collapsed} projectId={projectId} />
       </div>
 
+      {/* Master Controls Browser */}
+      <AdditionalModuleItem
+        href="/sdk/master-controls"
+        icon={
+          <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2}
+              d="M19 11H5m14 0a2 2 0 012 2v6a2 2 0 01-2 2H5a2 2 0 01-2-2v-6a2 2 0 012-2m14 0V9a2 2 0 00-2-2M5 11V9a2 2 0 012-2m0 0V5a2 2 0 012-2h6a2 2 0 012 2v2M7 7h10" />
+          </svg>
+        }
+        label="Master Controls"
+        isActive={pathname?.startsWith('/sdk/master-controls') ?? false}
+        collapsed={collapsed}
+        projectId={projectId}
+      />
+
       {/* Maschinenrecht / CE */}
       <div className="border-t border-gray-100 py-2">
         {!collapsed && (