Initial JPEG photo metadata editor v0.1

.env.example

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+# URL used by your browser through Caddy.
+# The application itself uses relative URLs, so this is informational and shown in /api/config.
+APP_URL=https://photos.example.internal
+
+# Host port exposed by Docker Compose. Caddy can reverse_proxy to this port.
+APP_PORT=8080
+
+# Optional settings
+APP_NAME=Photo Date Editor
+MAX_UPLOAD_MB=150
+LOG_LEVEL=INFO