dominicrume/cantor8_kya_rails: docs/outreach/forum-post-own-topic.md

Forum post: our own topic Where: https://forum.canton.network/ — App Development category, tags discuss and feedback. A NEW topic, not a reply. When: a day or two after the OpenZeppelin reply (post #8, 2026-09-08). Two posts in one afternoon reads as promotion. Links verified 2026-09-08: all four…