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>

src/routes/generating/+page.svelte

@@ -111,6 +111,8 @@
 
 			await goto(resolve('/options'));
 		} catch (err) {
+			if (!active) return;
+
 			// The server lost this job (e.g. a dev-server restart wipes the in-memory
 			// job store). The stored jobId is dead, so retrying is pointless — clear
 			// the stale flow and send the user back to re-upload.