Allow anonymous posts in public feed

- update posts_select RLS to allow approved/ok posts regardless of anonymity
- sync baseline and perf-fix migrations with live policy

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

infrastructure/migrations/001_schema.sql

@@ -207,10 +207,6 @@ CREATE POLICY "posts_select" ON public.posts FOR SELECT
     USING (
         deleted_at IS NULL
         AND review_status IN ('ok', 'approved')
-        AND (
-            NOT is_anonymous
-            OR user_id = (select auth.uid())
-        )
     );
 CREATE POLICY "posts_insert" ON public.posts FOR INSERT
     WITH CHECK ((select auth.uid()) = user_id);