Initial commit: postcard v1

Phone photo -> composited postcard (canvas templates, stamp corner,
EXIF-aware date/location, self-hosted handwriting font) with a small
server for share links, day-context caption drafting off goonk's
day-summary API, and Nominatim reverse geocoding.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,5 @@
+node_modules
+.env
+data
+server/data
+.claude/