fix(skr.classes.account): Remove incorrect SKR04 automatic account 3300; improve VAT posting validation and test isolation; update readme hints and CI settings

test/test.skr04.ts

@@ -7,10 +7,12 @@ let testConfig: Awaited<ReturnType<typeof getTestConfig>>;
 
 tap.test('should initialize SKR04 API', async () => {
   testConfig = await getTestConfig();
-  
+
+  // Use timestamp to ensure unique database for each test run
+  const timestamp = Date.now();
   api = new skr.SkrApi({
     mongoDbUrl: testConfig.mongoDbUrl,
-    dbName: `${testConfig.mongoDbName}_skr04`,
+    dbName: `${testConfig.mongoDbName}_skr04_${timestamp}`,
   });
 
   await api.initialize('SKR04');