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/apps/templates.js

@@ -10,7 +10,8 @@ const { exists } = require('../../fs-helpers');
  */
 const { REGEX } = require('../../constants');
 
-module.exports = function({ servicesStateManager, asyncHandler, helpers }) {
+module.exports = function(ctx) {
+  const { servicesStateManager, asyncHandler, helpers, docker, caddy, log, errorResponse } = ctx;
   const router = express.Router();
 
   // Get available app templates