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/__tests__/log-digest.test.js

@@ -29,13 +29,13 @@ jest.mock('fs', () => {
   };
 });
 
-jest.mock('../docker-maintenance', () => ({
+jest.mock('../src/docker/docker-maintenance', () => ({
   getDiskUsage: jest.fn().mockResolvedValue(null),
 }));
 
 const Docker = require('dockerode');
 const fs = require('fs');
-const logDigest = require('../log-digest');
+const logDigest = require('../src/security/log-digest');
 
 describe('LogDigest (singleton)', () => {
   let dockerInstance;