fix(routes): restore ctx access in 15 route files broken by Phase 2.1 refactor

The modular refactor changed function signatures to destructured deps but
left internal ctx.* references intact, causing "ctx is not defined" errors
on /api/config, /api/logo, and many other endpoints. Also implements
loadTotpConfig and saveTotpConfig which were left as stubs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

dashcaddy-api/routes/config/index.js

@@ -35,8 +35,8 @@ module.exports = function(ctx) {
     saveTotpConfig: ctx.saveTotpConfig
   };
   
-  router.use(require('./settings')(baseDeps));
-  router.use(require('./assets')({ ...baseDeps, CONFIG_FILE: ctx.CONFIG_FILE, readConfig: ctx.readConfig, saveConfig: ctx.saveConfig, errorResponse: ctx.errorResponse }));
+  router.use(require('./settings')(ctx));
+  router.use(require('./assets')(ctx));
   router.use(require('./backup')(backupDeps));
   return router;
 };