Added tests for Video & Audio

feat: video/audio metadata scanning, profile rename fix, route tests

  - Scan .mp4/.mov/.avi/.mkv and .mp3/.flac/.ogg/.m4a/.wma (+ 7 more)
    for GPS coordinates, artist/author, title, comment — metadata only,
    no frame or audio analysis. Uses mutagen (added to requirements.txt).
    GPS-tagged phone recordings now flag with gps_location like photos.

  - Fix _extract_audio_metadata silently returning empty results:
    mutagen.File() first positional arg is `filename`, not `fileobj` —
    was passing BytesIO as the filename. Fixed to keyword args.

  - Fix profile copy rename not reflected in left column until modal
    reopen: _pmgmtSaveFullEdit called loadProfiles() but never
    _renderProfileMgmt(). Added re-render and active-row highlight.

  - Add TestProfileRoutes (10 tests) covering all profile API endpoints
    including a rename regression test. Total: 182 tests.

  - generate_fixtures.py now produces 6 audio/video fixtures (14–19):
    2 MP3, 2 FLAC, 2 MP4 — 4 flagged, 2 negative cases.

requirements.txt

@@ -13,10 +13,11 @@ pdfplumber>=0.11       # PDF text extraction
 python-docx>=1.1       # Word document scanning
 openpyxl>=3.1          # Excel scanning + export
 
-# ── Image processing ──────────────────────────────────────────────────────────
+# ── Image / video processing ─────────────────────────────────────────────────
 Pillow>=10.0           # Image thumbnails + EXIF extraction (always-on)
 opencv-python>=4.9     # Face detection (opt-in — Scan photos for faces)
 numpy>=1.26            # Required by opencv-python
+mutagen>=1.47          # Video metadata extraction (MP4/MOV/AVI — GPS, author, title)
 
 # ── NER / PII detection ───────────────────────────────────────────────────────
 # spaCy 3.7 supports Python 3.8–3.12. Do NOT upgrade past Python 3.12.