docs: move the LOTUS_TODO / LOTUS_TESTING backlogs into Gitea issues; keep a reference-only LOTUS_REFERENCE.md

LOTUS_TODO.md → LOTUS_REFERENCE.md (design laws, decided deferrals,
server-blocked features, operational reference only). Every open task was
filed: cinny #195–#210, cinny-desktop #15–#18, matrix #8–#10.

LOTUS_TESTING.md keeps the automated-coverage map, the Playwright notes and
the deploy tip; every manual checklist is now a `qa` issue under the
'Manual QA backlog' (cinny #170–#194, #198) and 'Desktop QA backlog'
(cinny-desktop #11–#14, #18) milestones.

Repointed the README, LOTUS_FEATURES, CI and source comments that
referenced LOTUS_TODO.md.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

scripts/patch-folds.mjs

@@ -44,7 +44,7 @@ try {
     // patched form was found, meaning folds changed the Icon implementation.
     // Fail loudly so the postinstall hook / CI breaks instead of silently
     // shipping an unpatched folds (which crashes at render with "src is not a
-    // function"). See LOTUS_TODO.md "Dependencies / Build / Hygiene" for
+    // function"). See cinny #210 (build hygiene notes) for
     // context on why this is a direct node_modules patch rather than
     // patch-package.
     console.error('ERROR: folds Icon patch target not found.');
@@ -52,7 +52,7 @@ try {
     console.error(`  Expected to find (surrounding context):\n${original}`);
     console.error(
       '  folds likely changed its Icon implementation. Update the patch target ' +
-        'in scripts/patch-folds.mjs (see LOTUS_TODO -> "Dependencies / Build / Hygiene" ' +
+        'in scripts/patch-folds.mjs (see cinny #210 ' +
         '-> patch-folds.mjs entry) before building.',
     );
     process.exit(1);