Add community features to media outlets and improve UI

Implement community section for each media outlet, including post creation, viewing, and replies, along with navigation and backend API routes.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 9a264234-c5d7-4dcc-adf3-a954b149b30d
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/3df548ff-50ae-432f-9be4-25d34eccc983/9a264234-c5d7-4dcc-adf3-a954b149b30d/AX0T336

client/src/pages/MediaOutlet.tsx

@@ -262,6 +262,15 @@ export default function MediaOutlet() {
                     Auctions
                   </Button>
                   
+                  <Button 
+                    variant="ghost" 
+                    size="sm"
+                    onClick={() => setLocation(`/media/${outlet.slug}/community`)}
+                    data-testid="button-community"
+                  >
+                    Community
+                  </Button>
+                  
                   <Button 
                     variant="ghost" 
                     size="sm"