Add room_list_publication_rules to allow room publishing

- Allow all users to publish public rooms in room list
- Fixes 403 'Not allowed to publish room' error
- Applies to rooms with join_rule: public

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

apps/production/custom-configs/synapse-values.yaml

@@ -52,4 +52,12 @@ data:
           config: |
             auto_join_rooms:
               - "!NkFTshKWJMgdTqTbTh:axion1337.chat"
-            auto_join_rooms_for_guests: false
+            auto_join_rooms_for_guests: false
+        room_list_publication_rules:
+          config: |
+            room_list_publication_rules:
+              - user_id: "*"
+                alias: "*"
+                join_rule: public
+                room_type: null
+                action: allow