Feat v0.7.4 documentation + deferred surface work

Docs restructuring: category grouping (Getting Started, Platform,
Extension Development, Operations) with 14 ordered docs. Four new
guides: Permissions & Groups, Workflows, Starlark Reference, Frontend
JS Guide. Extension Guide updated with config_section docs.

Content refresh across 10 existing docs: rebrand volume names,
stale CSS vars, TLS_MODE env, self-hosted font notes, Architecture
frontend section.

Team Admin workflows.js (722 lines) split into 3 modules:
workflows.js (router+CRUD), workflow-editor.js (editor+stages),
workflow-monitor.js (assignments+monitor+signoff).

Fix: docs outline scroll no longer pushes topbar off-screen.
Fix: --bg-2 (undefined CSS var) replaced with --bg-secondary.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

VERSION

@@ -1 +1 @@
-0.7.3
+0.7.4