DC-005: Fix all 138 broken test paths after src/ refactor

After the DC-005 module reorganization (41 files moved into src/ subdirs),
138 test suites failed because the refactor script's path-rewrite logic
missed three categories:

1. Files inside src/ doing 'require("./src/...")' — should be 'require("../...")'
2. Files in src/X/Y/ doing 'require("../../../src/...")' — should be 'require("../../...")'
3. Test files in __tests__/ with leftover 'require("../../../src/...")' paths

Root cause: the original refactor script ran before all files were moved,
so it computed relative paths against stale filesystem state.

Result:
- 30/30 test suites pass
- 879/879 tests pass (was: 18/30 suites, 614/687 tests)

Also fixed:
- routes/apps/restore.js: wrong responses import path
- routes/*/*.js: '../../src/utilities/X' → '../src/utilities/X' (depth 2 routes)

dashcaddy-api/routes/health.js

@@ -2,13 +2,13 @@ const express = require('express');
 const fs = require('fs');
 const path = require('path');
 const { execSync } = require('child_process');
-const { TIMEOUTS } = require('../constants');
-const { exists } = require('../fs-helpers');
-const { paginate, parsePaginationParams } = require('../pagination');
+const { TIMEOUTS } = require('../src/utilities/constants');
+const { exists } = require('../src/utilities/fs-helpers');
+const { paginate, parsePaginationParams } = require('../src/utilities/pagination');
 const platformPaths = require('../platform-paths');
-const { resolveServiceUrl } = require('../url-resolver');
+const { resolveServiceUrl } = require('../src/utilities/url-resolver');
 const { success, error: errorResponse, errorResponse: sendError, ok, notFound } = require('../src/utils/responses');
-const { ValidationError } = require('../errors');
+const { ValidationError } = require('../src/utilities/errors');
 
 /**
  * Health routes factory
@@ -190,7 +190,7 @@ module.exports = function({
 
     // Load service config
     if (!await exists(SERVICES_FILE)) {
-      const { NotFoundError } = require('../errors');
+      const { NotFoundError } = require('../src/utilities/errors');
       throw new NotFoundError('Services file');
     }
 
@@ -199,7 +199,7 @@ module.exports = function({
     const service = services.find(s => (s.id || s.name?.toLowerCase()) === serviceId);
 
     if (!service) {
-      const { NotFoundError } = require('../errors');
+      const { NotFoundError } = require('../src/utilities/errors');
       throw new NotFoundError('Service');
     }
 
@@ -331,7 +331,7 @@ module.exports = function({
     const hours = parseInt(req.query.hours) || 24;
     const stats = healthChecker.getServiceStats(req.params.serviceId, hours);
     if (!stats) {
-      const { NotFoundError } = require('../errors');
+      const { NotFoundError } = require('../src/utilities/errors');
       throw new NotFoundError('Service');
     }
     success(res, { stats });