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/index.html

@@ -3,7 +3,8 @@
   <head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>shpm</title>
+    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
+    <title>Luma</title>
   </head>
   <body>
     <div id="root"></div>