exif(): read HEIF/HEIC originals with exifreader (closes #145)

photo.exif() and backup-metadata --exif read EXIF with exifreader,
which reads JPEG, HEIC/HEIF, AVIF, PNG and WebP, so a HEIC original or
a live photo's HEIC image gets its EXIF. exifreader replaces
exif-reader and the hand-written JPEG segment scan. PhotoExif is
unchanged. The exif field of backup-metadata --exif is now
exifreader's tag output, and exifRaw holds the whole EXIF block it
could not read. Tests use a real 933-byte HEIC fixture, test/exif.heic,
whose recipe is in test/exif-heic.ts.

Model: opus-5-5

package.json

@@ -46,7 +46,7 @@
         "@inquirer/prompts": "8.5.2",
         "commander": "14.0.3",
         "env-paths": "4.0.0",
-        "exif-reader": "2.0.3",
+        "exifreader": "4.46.0",
         "fast-srp-hap": "2.0.4",
         "fflate": "0.8.3",
         "jpeg-js": "0.4.4",