Fix TypeScript linting issues and test failures

- Replace 37 instances of 'any' type with proper TypeScript types
- Fix trailing spaces in i18n.test.ts
- Add proper interfaces for profanity analysis and matches
- Extend Express Request interface with custom properties
- Fix error handling in ProfanityFilterService for constraint violations
- Update test mocks to satisfy TypeScript strict checking
- All 147 tests now pass with 0 linting errors

🤖 Generated with [Claude Code](https://claude.ai/code)

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

tests/integration/routes/i18n.test.ts

@@ -23,10 +23,9 @@ describe('I18n API Routes', () => {
   beforeEach(() => {
     app = express();
     app.use('/api/i18n', createI18nRoutes());
-    
+
     // Reset mocks
     jest.clearAllMocks();
-    
     // Default mock implementations
     mockI18nService.getAvailableLocales.mockReturnValue(['en', 'es-MX']);
     mockI18nService.getDefaultLocale.mockReturnValue('en');