Map admins: owners invite friends to co-manage maps

Owners can invite players by name from the map workshop; invitees accept
from their dashboard and then manage the map (details, locations,
submission, refresh, contributions, appeals) through owner-delegated
checks. Adds the map_admins table, invite/admin API endpoints, dashboard
invite box, workshop admin management, and Russian translations.

package.json

@@ -21,6 +21,7 @@
     "bots": "node scripts/moderator-bots.mjs",
     "test": "tsx --test tests/*.test.ts",
     "test:leaderboard": "node scripts/test-leaderboard-sql.mjs",
+    "test:map-admins": "node scripts/test-map-admins-sql.mjs",
     "test:moderator-applications": "node scripts/test-moderator-applications-sql.mjs",
     "test:multiplayer": "node scripts/test-multiplayer-sql.mjs",
     "test:round-panoramas": "node scripts/test-round-panoramas-sql.mjs",