feat(sidebar): Add module gating to Manufacturing section

Manufacturing section now requires has_manufacturing module:
- Shows to all sellers with business profile
- Displays as locked "Premium Feature" when module disabled
- Unlocks with full access when module enabled (for owners/admins)
- Consistent with Buyer Analytics and Processing module patterns

Manufacturing locked state shows:
- Lock icon
- "Manufacturing" title
- "Premium Feature" subtitle
- Greyed out appearance (opacity-50)
- Tooltip: "Premium feature - contact support to enable"

All premium modules now properly gated:
- Buyer Analytics (has_analytics)
- Processing (has_processing)
- Manufacturing (has_manufacturing)

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

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

resources/views/components/seller-sidebar.blade.php

@@ -513,9 +513,11 @@
                 </div>
                 @endif
 
-                @if($canManageBusiness)
-                {{-- Manufacturing Section for managers and owners only --}}
+                {{-- Manufacturing Module (Premium Feature) --}}
+                @if($sidebarBusiness)
                 <p class="menu-label px-2.5 pt-3 pb-1.5 first:pt-0">Manufacturing</p>
+                @if($sidebarBusiness->has_manufacturing && $canManageBusiness)
+                {{-- Module enabled - full access for owners/admins --}}
                 <div class="group collapse">
                     <input
                         aria-label="Sidemenu item trigger"
@@ -528,7 +530,6 @@
                         <span class="grow">Manufacturing</span>
                         <span class="icon-[lucide--chevron-right] arrow-icon size-3.5"></span>
                     </div>
-                    @if($sidebarBusiness)
                     <div class="collapse-content ms-6.5 !p-0">
                         <div class="mt-0.5 space-y-0.5">
                             <a class="menu-item {{ request()->routeIs('seller.business.manufacturing.purchase-orders.*') ? 'active' : '' }}" href="{{ route('seller.business.manufacturing.purchase-orders.index', $sidebarBusiness->slug) }}">
@@ -547,15 +548,20 @@
                             @endif
                         </div>
                     </div>
-                    @else
-                    <div class="collapse-content ms-6.5 !p-0">
-                        <div class="mt-0.5 px-3 py-2">
-                            <p class="text-xs text-base-content/60">Complete your business profile to manage manufacturing</p>
+                </div>
+                @else
+                {{-- Module not enabled - show as locked premium feature --}}
+                <div class="px-2.5 py-1.5 opacity-50 cursor-not-allowed" title="Premium feature - contact support to enable">
+                    <div class="flex items-center gap-2">
+                        <span class="icon-[lucide--lock] size-4"></span>
+                        <div class="flex flex-col grow">
+                            <span class="text-sm font-medium">Manufacturing</span>
+                            <span class="text-xs text-base-content/60">Premium Feature</span>
                         </div>
                     </div>
-                    @endif
                 </div>
                 @endif
+                @endif
 
 
                 {{-- Reports Section - Department-based (Bottom of Navigation) --}}