feat(BE): approval_workflow, adjusment project_flocks, common, and migration

internal/database/migrations/20251017071755_rename_approval_status_to_action.down.sql

@@ -0,0 +1,18 @@
+ALTER TABLE approvals
+    RENAME COLUMN action TO status;
+
+UPDATE approvals
+SET status = 'PENDING'
+WHERE status IS NULL;
+
+ALTER TABLE approvals
+    ALTER COLUMN status SET NOT NULL;
+
+ALTER TABLE approvals
+    RENAME COLUMN step_number TO step;
+
+ALTER TABLE approvals
+    DROP COLUMN step_name;
+
+ALTER TABLE approvals
+    RENAME COLUMN action_at TO created_at;