chore: update seed file references and concatenate seed SQL into migrations (#119)

- Renamed test_helpers.sql to seed.sql in configuration
- Updated script to include seed.sql content instead of test_helpers.sql
- Ensured seed data is integrated into migration concatenation process

Author: jumski

pkgs/core/supabase/config.toml

@@ -9,7 +9,7 @@ major_version = 15
 [db.seed]
 enabled = true
 sql_paths = [
-  "test_helpers.sql",
+  "seed.sql",
 ]
 
 [api]

pkgs/core/supabase/test_helpers.sql renamed to pkgs/core/supabase/seed.sql

@@ -16,7 +16,7 @@ for f in $(find ../core/supabase/migrations -name '*.sql' | sort); do
 done
 
 # And copy the pgflow_tests
-echo "-- From file: test_helpers.sql" >> "$target_file"
-cat "../core/supabase/test_helpers.sql" >> "$target_file"
+echo "-- From file: seed.sql" >> "$target_file"
+cat "../core/supabase/seed.sql" >> "$target_file"
 echo "" >> "$target_file"
 echo "" >> "$target_file"