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/browse.js

@@ -2,9 +2,9 @@ const express = require('express');
 const fs = require('fs');
 const fsp = require('fs').promises;
 const path = require('path');
-const { exists, isAccessible } = require('../fs-helpers');
-const { paginate, parsePaginationParams } = require('../pagination');
-const { ValidationError, ForbiddenError } = require('../errors');
+const { exists, isAccessible } = require('../src/utilities/fs-helpers');
+const { paginate, parsePaginationParams } = require('../src/utilities/pagination');
+const { ValidationError, ForbiddenError } = require('../src/utilities/errors');
 const { ok } = require('../src/utils/responses');
 
 /**
@@ -99,7 +99,7 @@ module.exports = function({ asyncHandler, validateSecurePath, auditLogger, docke
     }
 
     if (!await exists(resolvedPath)) {
-      const { NotFoundError } = require('../errors');
+      const { NotFoundError } = require('../src/utilities/errors');
       throw new NotFoundError('Path');
     }