Refactor config routes: explicit dependency injection

- Updated all config route modules to use destructured dependencies
- Added JSDoc comments for factory functions
- Replaced ctx. references with direct parameter access
- All files pass syntax validation

Files refactored:
- routes/config/assets.js
- routes/config/backup.js
- routes/config/settings.js
- routes/config/index.js (orchestrator)

dashcaddy-api/routes/config/settings.js

@@ -3,14 +3,22 @@ const { validateConfig } = require('../../config-schema');
 const { exists } = require('../../fs-helpers');
 const { ValidationError } = require('../errors');
 
-module.exports = function(ctx) {
+module.exports = function({ configStateManager, asyncHandler, log }) {
+/**
+ * Config settings routes factory
+ * @param {Object} deps - Explicit dependencies
+ * @param {Object} deps.configStateManager - Config state manager
+ * @param {Function} deps.asyncHandler - Async route handler wrapper
+ * @param {Object} deps.log - Logger instance
+ * @returns {express.Router}
+ */
   const express = require('express');
   const router = express.Router();
 
   // ===== DASHCADDY CONFIG ENDPOINTS =====
   // Server-side config storage for setup wizard (shared across all browsers/machines)
 
-  router.get('/config', ctx.asyncHandler(async (req, res) => {
+  router.get('/config', asyncHandler(async (req, res) => {
     if (!await exists(ctx.CONFIG_FILE)) {
       return res.json({ setupComplete: false });
     }
@@ -19,7 +27,7 @@ module.exports = function(ctx) {
     res.json(config);
   }, 'config-get'));
 
-  router.post('/config', ctx.asyncHandler(async (req, res) => {
+  router.post('/config', asyncHandler(async (req, res) => {
     const incoming = req.body;
 
     if (!incoming || typeof incoming !== 'object') {
@@ -55,12 +63,12 @@ module.exports = function(ctx) {
 
     await fsp.writeFile(ctx.CONFIG_FILE, JSON.stringify(config, null, 2), 'utf8');
     ctx.loadSiteConfig(); // Refresh in-memory config
-    ctx.log.info('config', 'Config saved', { path: ctx.CONFIG_FILE });
+    log.info('config', 'Config saved', { path: ctx.CONFIG_FILE });
 
     res.json({ success: true, message: 'Configuration saved', config, warnings });
   }, 'config-save'));
 
-  router.delete('/config', ctx.asyncHandler(async (req, res) => {
+  router.delete('/config', asyncHandler(async (req, res) => {
     if (await exists(ctx.CONFIG_FILE)) {
       await fsp.unlink(ctx.CONFIG_FILE);
     }