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>

docker-compose.yml

@@ -0,0 +1,25 @@
+services:
+  app:
+    image: ${IMAGE}
+    container_name: postcard
+    restart: unless-stopped
+    pull_policy: always
+    ports:
+      - "${HOST_PORT:-3098}:3098"
+    environment:
+      - TTL_HOURS=${TTL_HOURS:-72}
+      - MAX_UPLOAD_BYTES=${MAX_UPLOAD_BYTES:-20971520}
+      - RATE_LIMIT_PER_HOUR=${RATE_LIMIT_PER_HOUR:-30}
+      # Day-context source for caption drafting — see README. Left unset,
+      # captions fall back to generic postcard-voice lines.
+      - DAY_SUMMARY_URL=${DAY_SUMMARY_URL:-}
+      # Reverse-geocoding endpoint for the stamp corner's location line.
+      # Defaults to the public Nominatim instance if unset.
+      - NOMINATIM_URL=${NOMINATIM_URL:-}
+    volumes:
+      # Named volume, not a bind mount into the build context — the SQLite
+      # db and image blobs live here and must survive image redeploys.
+      - postcard-data:/app/data
+
+volumes:
+  postcard-data: