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__/health-checker.test.js

@@ -17,7 +17,7 @@ describe('HealthChecker', () => {
     fs.writeFileSync.mockImplementation(() => {});
 
     // Fresh instance each test
-    HealthChecker = require('../health-checker').constructor;
+    HealthChecker = require('../src/monitoring/health-checker').constructor;
     healthChecker = new HealthChecker();
   });
 
@@ -41,7 +41,7 @@ describe('HealthChecker', () => {
         services: { svc1: { url: 'http://test.local', enabled: true } }
       }));
 
-      HealthChecker = require('../health-checker').constructor;
+      HealthChecker = require('../src/monitoring/health-checker').constructor;
       const hc = new HealthChecker();
       expect(hc.config.services.svc1).toBeDefined();
     });
@@ -52,7 +52,7 @@ describe('HealthChecker', () => {
       fs.existsSync.mockReturnValue(true);
       fs.readFileSync.mockReturnValue('invalid json');
 
-      HealthChecker = require('../health-checker').constructor;
+      HealthChecker = require('../src/monitoring/health-checker').constructor;
       const hc = new HealthChecker();
       expect(hc.config).toEqual({ services: {} });
     });