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/bouquet-s.svg

@@ -0,0 +1,10 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="768" height="1024" viewBox="0 0 768 1024">
+  <rect width="768" height="1024" fill="#f5ebe3"/>
+  <rect x="80" y="720" width="608" height="200" rx="12" fill="#e8ddd4"/>
+  <text x="384" y="680" text-anchor="middle" font-size="28" fill="#8b7355" font-family="Georgia, serif">Small bouquet</text>
+  <circle cx="320" cy="420" r="48" fill="#f4a6b8"/>
+  <circle cx="384" cy="380" r="56" fill="#f8c8d4"/>
+  <circle cx="448" cy="420" r="44" fill="#efb4c4"/>
+  <rect x="368" y="460" width="32" height="260" rx="8" fill="#6b8f71"/>
+  <text x="384" y="960" text-anchor="middle" font-size="36" fill="#6b5b53" font-family="Arial">S</text>
+</svg>