Add profile photo uploads and custom difficulty support

supabase/migrations/20261013123545_profile_avatars.sql

@@ -0,0 +1,34 @@
+alter table public.profiles
+  add column avatar_path text;
+
+insert into storage.buckets(id, name, public, file_size_limit, allowed_mime_types)
+values (
+  'minegeo-avatars',
+  'minegeo-avatars',
+  true,
+  5242880,
+  array['image/jpeg', 'image/png', 'image/webp']
+)
+on conflict (id) do update set
+  name = excluded.name,
+  public = excluded.public,
+  file_size_limit = excluded.file_size_limit,
+  allowed_mime_types = excluded.allowed_mime_types;
+
+create policy "MineGeo users upload their own avatars"
+on storage.objects
+for insert
+to authenticated
+with check (
+  bucket_id = 'minegeo-avatars'
+  and (storage.foldername(name))[1] = (select auth.uid()::text)
+);
+
+create policy "MineGeo users delete their own avatars"
+on storage.objects
+for delete
+to authenticated
+using (
+  bucket_id = 'minegeo-avatars'
+  and (storage.foldername(name))[1] = (select auth.uid()::text)
+);