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>

docs/manuals/MANUAL-EN.md

@@ -496,6 +496,10 @@ These options are in the left sidebar under **Indstillinger**:
 
 **Scan photos for faces** — slower scan that detects photographs containing recognisable human faces. Flags them as Article 9 biometric data. Recommended for schools storing student photos.
 
+**Ignore GPS in images** — when enabled, images whose only PII signal is an embedded GPS location are not flagged. Useful when scanning student accounts: smartphones embed GPS coordinates in every photo taken with the camera app, which would otherwise generate large numbers of flags that are low-priority for a school context. If an image is already flagged for another reason (faces, EXIF author field), the GPS coordinate is still shown in the detail card.
+
+**Min. CPR count per file** — only flag a file if it contains at least this many *distinct* CPR numbers. The default is 1 (current behaviour). Setting it to 2 avoids false positives in student scans: a student's own consent form or registration document typically contains only their own CPR number, while a class list or grade sheet containing multiple students' CPRs will still be reported.
+
 **Retention policy** — when enabled, marks items older than the specified number of years as overdue. The fiscal year end setting determines how the cutoff date is calculated:
 
 | Option | Cutoff date calculation |