rebrand: Papermark → Hanzo Dataroom across user-facing surfaces
108 files: README, marketing copy, page titles, meta tags, footer
text, email templates, .env.example, UI strings. URLs swapped
from papermark.com/papermark.io to dataroom.hanzo.ai.
Internal identifiers left intact per repo policy: localStorage
keys (papermark.email/papermark.name/last_papermark_login —
changing them logs users out), type field names
(papermarkUserId), internal helper symbols (PAPERMARK_HEADERS,
PapermarkSparkle component, isPapermarkUrl helper),
internal-only filenames. LLM.md retains 'Upstream: Papermark'
attribution line. Per-locale .po translations regenerate from
source on the next lingui-extract CI run.
DB migrations untouched (append-only history; rewriting them
breaks installed schemas). LICENSE stays AGPL-3.0.