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>

static/js/scan.js

@@ -125,6 +125,8 @@ function buildScanPayload() {
     max_emails:       parseInt(document.getElementById('optMaxEmails').value) || 200,
     delta:            document.getElementById('optDelta') ? document.getElementById('optDelta').checked : false,
     scan_photos:      document.getElementById('optScanPhotos') ? document.getElementById('optScanPhotos').checked : false,
+    skip_gps_images:  document.getElementById('optSkipGps') ? document.getElementById('optSkipGps').checked : false,
+    min_cpr_count:    document.getElementById('optMinCpr') ? (parseInt(document.getElementById('optMinCpr').value) || 1) : 1,
     retention_enabled: document.getElementById('optRetention') ? document.getElementById('optRetention').checked : false,
     retention_years:  parseInt(document.getElementById('optRetentionYears')?.value) || 5,
     fiscal_year_end:  document.getElementById('optFiscalYearEnd')?.value || '',
@@ -570,7 +572,11 @@ function startScan(resume) {
       if (!source) return;
       fetch('/api/file_scan/start', {
         method: 'POST', headers: {'Content-Type':'application/json'},
-        body: JSON.stringify(Object.assign({}, source, {scan_photos: options.scan_photos || false}))
+        body: JSON.stringify(Object.assign({}, source, {
+          scan_photos:      options.scan_photos     || false,
+          skip_gps_images:  options.skip_gps_images || false,
+          min_cpr_count:    options.min_cpr_count   || 1,
+        }))
       }).catch(e => { log('File scan error: ' + e, 'err'); });
     });