API: follower lists, blocking, reports, admin; drop Spotify sign-in

- Followers/following lists (paginated), 'follows you', remove a follower
- Blocking severs follows both ways and hides each user from the other
  (profile 404s, search, follows); the blocker sees activity hidden
- Reports for moderation (App Store guideline 1.2)
- First account on a server becomes admin; admins see the report queue,
  resolve reports, and suspend accounts (signs out, blocks login, hides
  the profile, stops sharing). set-role script to promote/demote
- users.onboardedAt drives first-run onboarding; existing accounts are
  backfilled as already onboarded. Empty PATCH /me no longer 500s
- Remove Spotify account sign-in and polling: Spotify caps new apps at 5
  accounts, so Spotify arrives via its Last.fm/ListenBrainz link or the
  Android reader. App-level catalog search stays for exact links
- Shared: QR code generation and profile-link parsing (verified with jsQR)
- Integration test timeout raised; password hashing is slow by design

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MzFywujuH9TiuXbr9vjoX8

apps/mobile/assets/expo.icon/Assets/expo-symbol 2.svg

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-</svg>

apps/mobile/assets/expo.icon/icon.json

@@ -1,40 +0,0 @@
-{
-  "fill" : {
-    "automatic-gradient" : "extended-srgb:0.00000,0.47843,1.00000,1.00000"
-  },
-  "groups" : [
-    {
-      "layers" : [
-        {
-          "image-name" : "expo-symbol 2.svg",
-          "name" : "expo-symbol 2",
-          "position" : {
-            "scale" : 1,
-            "translation-in-points" : [
-              1.1008400065293245e-05,
-              -16.046875
-            ]
-          }
-        },
-        {
-          "image-name" : "grid.png",
-          "name" : "grid"
-        }
-      ],
-      "shadow" : {
-        "kind" : "neutral",
-        "opacity" : 0.5
-      },
-      "translucency" : {
-        "enabled" : true,
-        "value" : 0.5
-      }
-    }
-  ],
-  "supported-platforms" : {
-    "circles" : [
-      "watchOS"
-    ],
-    "squares" : "shared"
-  }
-}