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>

fonts/OFL.txt

@@ -0,0 +1,6 @@
+Caveat — SIL Open Font License, Version 1.1
+
+Fetched from Google Fonts (fonts.gstatic.com), latin subset, variable
+weight (400-700). See https://fonts.google.com/specimen/Caveat for the
+canonical source and full license text:
+https://openfontlicense.org