fix: resolve all lint errors from L4 feature

- Remove unused Box/Collapse from L4PortsApplyBanner
- Remove unused Stack from RedirectsFields
- Remove unused updateL4ProxyHost import from validation test
- Add eslint-disable-next-line for require() in vi.hoisted() blocks
  (necessary pattern since vi.hoisted runs before ESM imports)
- Add file-level eslint-disable no-explicit-any for test files that
  intentionally pass invalid types to test validation logic

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/integration/instance-sync.test.ts

@@ -18,8 +18,11 @@ import type { TestDb } from '../helpers/db';
 // ---------------------------------------------------------------------------
 
 const ctx = vi.hoisted(() => {
+  // eslint-disable-next-line @typescript-eslint/no-require-imports
   const { mkdirSync } = require('node:fs');
+  // eslint-disable-next-line @typescript-eslint/no-require-imports
   const { join } = require('node:path');
+  // eslint-disable-next-line @typescript-eslint/no-require-imports
   const { tmpdir } = require('node:os');
   const dir = join(tmpdir(), `instance-sync-test-${Date.now()}`);
   mkdirSync(dir, { recursive: true });