feat: add options/map flow, dev seed, and artwork fixes

Options page, Kakao map with florist order message, dev tooling, and
create/message dummy gating — without secrets in .env.example.

Co-authored-by: 이지은 <ijieun@ijieun-ui-MacBookPro.local>
Co-authored-by: Cursor <cursoragent@cursor.com>

static/dev/upload/sns-1.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="400" height="500" viewBox="0 0 400 500">
+  <rect width="400" height="500" fill="#f5ebe3"/>
+  <text x="200" y="260" text-anchor="middle" font-size="24" fill="#8b7355" font-family="Georgia">SNS feed 1</text>
+</svg>