Clean up unused imports and variables to improve code quality

- Remove unused imports: LocationSubmission from types, Location/ProfanityWord from server
- Remove unused variables: wordText, detectedWords in profanity rejection
- Remove unused parameters: req in skip function, wordId/updates in fallback filter
- Fix regex escaping and destructuring patterns
- Remove unused response variables in tests
- Reduce ESLint issues from 45 to 22 (eliminated all 21 errors, keeping only warnings)

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

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

tests/integration/routes/admin.test.ts

@@ -510,7 +510,7 @@ describe('Admin API Routes', () => {
     });
 
     it('should handle malformed JSON in request body', async () => {
-      const response = await request(app)
+      await request(app)
         .post('/api/admin/profanity-words')
         .set('Authorization', `Bearer ${authToken}`)
         .set('Content-Type', 'application/json')
@@ -521,7 +521,7 @@ describe('Admin API Routes', () => {
     });
 
     it('should handle missing content-type header', async () => {
-      const response = await request(app)
+      await request(app)
         .post('/api/admin/profanity-words')
         .set('Authorization', `Bearer ${authToken}`)
         .send('word=test&severity=low&category=test')

tests/integration/routes/public.test.ts

@@ -302,7 +302,7 @@ describe('Public API Routes', () => {
     });
 
     it('should handle malformed JSON', async () => {
-      const response = await request(app)
+      await request(app)
         .post('/api/locations')
         .set('Content-Type', 'application/json')
         .send('{"address": "Test Location"') // Missing closing brace

tests/setup.ts

@@ -1,6 +1,4 @@
 import { Database } from 'sqlite3';
-import fs from 'fs';
-import path from 'path';
 
 // Setup test environment
 process.env.NODE_ENV = 'test';

tests/unit/services/DatabaseService.test.ts

@@ -16,7 +16,7 @@ describe('DatabaseService', () => {
     jest.restoreAllMocks();
     try {
       databaseService.close();
-    } catch (e) {
+    } catch {
       // Ignore close errors in tests
     }
   });