test: standardize naming conventions to snake_case

- Rename demo_event_id → testing_event_id (more explicit)
- Rename demo_account_id → testing_account_id (matches convention)
- Rename demo_badge_id → event_badge_id (descriptive)
- Rename demo_template_id → event_badge_template_id (explicit)
- Update all test files for consistency (15 files)
- Enhance README with organized test data sections
- Update person IDs to match README test data
- No regression: 15 tests passing, 7 pre-existing failures unchanged

tests/v3_api_security.modern.test.ts

@@ -55,12 +55,12 @@ test.describe('V3 API Header Integrity (modernized)', () => {
 	});
 
 	test('Verify Account ID Scavenging from localStorage on CRUD requests', async ({ page }) => {
-		const testAccountId = 'scavenged-account-id-123';
+		const test_account_id = '_XY7DXtc9MY'; // Per README test data
 
 		await page.addInitScript(({ defaults, id }) => {
 			const testData = { ...defaults, account_id: id, manager_access: true };
 			window.localStorage.setItem('ae_loc', JSON.stringify(testData));
-		}, { defaults: ae_app_local_data_defaults, id: testAccountId });
+		}, { defaults: ae_app_local_data_defaults, id: test_account_id });
 
 		const requestPromise = page.waitForRequest((request) => request.url().includes('/v3/crud/user/search'));
 
@@ -69,6 +69,6 @@ test.describe('V3 API Header Integrity (modernized)', () => {
 		const request = await requestPromise;
 		const headers = request.headers();
 
-		expect(headers['x-account-id']).toBe(testAccountId);
+		expect(headers['x-account-id']).toBe(test_account_id);
 	});
 });