feat: photo sync (iCloud + Amazon import), larger gear icon, Luma branding

- Settings: iCloud Photos section with icloudpd-backed sync — Apple ID,
  password, download path, cookie dir, live log output via SSE
- Settings: Amazon Photos one-time import — path to extracted data export,
  Add & Index button wires it directly into Watch Folders
- scripts/amazon_sync.py: stdlib-only downloader using Netscape cookie file
- server: POST /api/sync/icloud, /api/sync/amazon, GET /api/sync/stream
  (SSE log streaming matching ingest stream pattern)
- db: icloud/amazon setting keys; getSettings handles bool + string fields
- Gear icon: fontSize 16→20, button 38×38, color #555→#888
- favicon.svg: 6-blade aperture icon in Luma blue
- Browser tab title: shpm → Luma
- Dockerfile: installs icloudpd via pip3, copies scripts/

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

client/src/App.jsx

@@ -149,9 +149,9 @@ export default function App() {
             style={{
               background: showSettings ? '#1e2a3a' : 'transparent',
               border: 'none', borderRadius: 6,
-              color: showSettings ? '#7ab8f5' : '#555',
-              cursor: 'pointer', fontSize: 16,
-              width: 32, height: 32,
+              color: showSettings ? '#7ab8f5' : '#888',
+              cursor: 'pointer', fontSize: 20,
+              width: 38, height: 38,
               display: 'flex', alignItems: 'center', justifyContent: 'center',
             }}
           >