Run bootstrap seeds in production; add RUN_DEV_SEEDS support

priv/repo/seeds.exs

@@ -5,6 +5,9 @@
 # Bootstrap runs in all environments. Dev seeds (members, groups, sample data)
 # run only in dev and test.
 #
+# In production (release): seeds are run via Mv.Release.run_seeds/0 from the
+# container entrypoint. Set RUN_DEV_SEEDS=true to also run dev seeds there.
+#
 # Compiler option ignore_module_conflict is set only during seed evaluation
 # so that eval_file of bootstrap/dev does not emit "redefining module" warnings;
 # it is always restored in `after` to avoid hiding real conflicts elsewhere.