feat: reduce Community Edition user limit from 50 to 10

Reduces the hardcoded max users for Community Edition from 50 to 10.

Changes:
- Backend: MAX_USERS_COMMUNITY constant (enforcement)
- Frontend: Display messages on users and tenants pages
- README: Documentation update

Ref: GT-Edge-AI-Internal/GT-2.0#289

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

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

apps/control-panel-frontend/src/app/dashboard/tenants/page.tsx

@@ -155,7 +155,7 @@ export default function TenantsPage() {
             Manage your tenant configuration
           </p>
           <p className="text-sm text-amber-600 mt-1">
-            GT AI OS Community Edition: Limited to 50 users per tenant
+            GT AI OS Community Edition: Limited to 10 users per tenant
           </p>
         </div>
       </div>
@@ -210,7 +210,7 @@ export default function TenantsPage() {
               <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
                 <div>
                   <p className="text-sm font-medium text-muted-foreground">Users</p>
-                  <p className="text-2xl font-bold">{tenant.user_count} <span className="text-sm font-normal text-muted-foreground">/ 50</span></p>
+                  <p className="text-2xl font-bold">{tenant.user_count} <span className="text-sm font-normal text-muted-foreground">/ 10</span></p>
                 </div>
                 <div>
                   <p className="text-sm font-medium text-muted-foreground">Domain</p>

apps/control-panel-frontend/src/app/dashboard/users/page.tsx

@@ -329,7 +329,7 @@ export default function UsersPage() {
             Manage users and access permissions
           </p>
           <p className="text-sm text-amber-600 mt-1">
-            GT AI OS Community Edition: Limited to 50 users
+            GT AI OS Community Edition: Limited to 10 users
           </p>
         </div>
         <div className="flex space-x-2">

apps/control-panel-frontend/src/app/tenants/page.tsx

@@ -143,7 +143,7 @@ export default function TenantsPage() {
         domain: 'betatest',
         template: 'development',
         status: 'suspended',
-        max_users: 50,
+        max_users: 10,
         current_users: 12,
         namespace: 'gt-tenant-betatest',
         resource_count: 5,