feat!: remove the shared demo account

The demo account — one shared user that whitelisted emails entered from
the login page, reset on a schedule — goes end to end (owner decision,
E34): demo.py and the reset job, users.is_demo and demo_whitelist
(migration 0098 deletes the demo user, its audit rows, the reset job's
override and notices, then drops the column and table; the downgrade
restores the empty schema), the /auth/demo entry, the admin whitelist and
reset, the Demo tab, the banner, the login page's "Try the demo", and
every is_demo branch in routes, userscope, scheduler and the UI.

require_human only ever refused the demo account, so its 87 uses become
current_user (owner-approved); require_write_scope keeps its own check.
The login page's "or" divider now shows only beside the Google button:
without the demo entry under it, an instance without Google would have
said "or" to nothing.

A contract test (removedFeatures) fails on the word anywhere in the
backend, frontend, e2e or scripts — seen red on a planted hit. Size
ceilings tightened for the modules that shrank; admin.py is back under
the limit.

backend/app/routes/feed.py

@@ -419,11 +419,7 @@ def get_video_detail(
             "duration_seconds": v.duration_seconds,
         }
 
-    # The DB path above is free; the off-catalog YouTube lookup below spends a quota unit, so the
-    # demo account can't reach it — it just sees "unknown" for a video we don't already store.
-    if user.is_demo:
-        raise not_found("video")
-
+    # The DB path above is free; the off-catalog YouTube lookup below spends a quota unit.
     try:
         with (
             quota.attribute(user.id, quota.QuotaAction.VIDEOS_LOOKUP),