feat: student scan filters — skip GPS images and min CPR threshold

New profile options to reduce noise when scanning student accounts:

- skip_gps_images: images flagged solely by GPS coordinates are suppressed.
  GPS data is still extracted and shown in the detail card when the item
  is flagged by another signal (faces, EXIF author/comment).

- min_cpr_count (default 1): only flag a file if it contains at least N
  distinct CPR numbers. Deduplication is by value. Faces and EXIF PII
  still trigger flags regardless of CPR count.

Both options apply to M365, Google, and file scan paths. Saved in profiles
and editable in the Profile Manager editor. Docs, manuals, i18n (DA/EN/DE),
CHANGELOG, and VERSION (1.6.14 → 1.6.15) updated.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lang/en.json

@@ -559,6 +559,10 @@
   "m365_db_import_run": "Import",
   "m365_opt_scan_photos": "Scan photos for faces",
   "m365_opt_scan_photos_hint": "Flags images with detected faces as Art. 9 biometric data. Slower — opt in.",
+  "m365_opt_skip_gps": "Ignore GPS in images",
+  "m365_opt_skip_gps_hint": "Images with GPS coordinates are not flagged — useful when scanning students whose smartphones embed location in every photo.",
+  "m365_opt_min_cpr": "Min. CPR count per file",
+  "m365_opt_min_cpr_hint": "Files with fewer distinct CPR numbers than this threshold are not reported. Set to 2 to avoid false positives when students have their own CPR in documents.",
   "m365_filter_photo_only": "📷 Photos / biometric",
   "m365_badge_faces": "faces",
   "a30_photo_items": "Photos with detected faces (Art. 9 biometric)",