Restructure navigation: move setup items to Settings with accordion menu

Move rarely-used setup items from main sidebar to Settings to keep
daily-use features prominent:

- Services → Settings > Business section
- Locations → Settings > Business section
- Site Builder → Settings > Branding section

Settings sidebar changes:
- Convert static sections to accordion (one open at a time)
- Auto-expand section based on current URL
- Preserve all permission checks for moved items

Add redirects from old URLs to new locations for backwards compatibility.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/App.tsx

@@ -879,15 +879,10 @@ const AppContent: React.FC = () => {
                 )
               }
             />
+            {/* Redirect old services path to new settings location */}
             <Route
               path="/dashboard/services"
-              element={
-                canAccess('can_access_services') ? (
-                  <Services />
-                ) : (
-                  <Navigate to="/dashboard" />
-                )
-              }
+              element={<Navigate to="/dashboard/settings/services" replace />}
             />
             <Route
               path="/dashboard/resources"
@@ -919,15 +914,10 @@ const AppContent: React.FC = () => {
                 )
               }
             />
+            {/* Redirect old locations path to new settings location */}
             <Route
               path="/dashboard/locations"
-              element={
-                canAccess('can_access_locations') ? (
-                  <Locations />
-                ) : (
-                  <Navigate to="/dashboard" />
-                )
-              }
+              element={<Navigate to="/dashboard/settings/locations" replace />}
             />
             <Route
               path="/dashboard/my-availability"
@@ -975,15 +965,10 @@ const AppContent: React.FC = () => {
                 )
               }
             />
+            {/* Redirect old site-editor path to new settings location */}
             <Route
               path="/dashboard/site-editor"
-              element={
-                canAccess('can_access_site_editor') ? (
-                  <PageEditor />
-                ) : (
-                  <Navigate to="/dashboard" />
-                )
-              }
+              element={<Navigate to="/dashboard/settings/site-builder" replace />}
             />
             <Route
               path="/dashboard/email-template-editor/:emailType"
@@ -1025,6 +1010,10 @@ const AppContent: React.FC = () => {
                 <Route path="sms-calling" element={<CommunicationSettings />} />
                 <Route path="billing" element={<BillingSettings />} />
                 <Route path="quota" element={<QuotaSettings />} />
+                {/* Moved from main sidebar */}
+                <Route path="services" element={<Services />} />
+                <Route path="locations" element={<Locations />} />
+                <Route path="site-builder" element={<PageEditor />} />
               </Route>
             ) : (
               <Route path="/dashboard/settings/*" element={<Navigate to="/dashboard" />} />