feat: web dashboard and playground work

The NexusDashboard-parity dashboard (dDashboardServer) and everything built on it on the experimental branch:
accounts, characters, properties and moderation tools, permissions shared with in-game slash commands, economy
reports, World 3D and property 3D views with client scenery, scheduled events (features, vanity changes, live
events, announcements, restarts), vanity files and events, the CDClient browser, the message inspector with saved
captures, chat filter tools, community challenges, live ops, the AI moderator helper, and the server-side changes
they need.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

migrations/dlu/sqlite/20_account_notes.sql

@@ -0,0 +1,12 @@
+/* Moderation history per account, and temporary bans. See the MySQL migration. */
+ALTER TABLE accounts ADD COLUMN ban_expires BIGINT NOT NULL DEFAULT 0;
+ALTER TABLE accounts ADD COLUMN ban_reason TEXT NULL;
+CREATE TABLE IF NOT EXISTS account_notes (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    account_id INTEGER NOT NULL,
+    kind TEXT NOT NULL,
+    text TEXT NOT NULL,
+    actor TEXT NOT NULL DEFAULT '',
+    created_at BIGINT NOT NULL
+);
+CREATE INDEX IF NOT EXISTS account_notes_account ON account_notes (account_id, id);