💾 feat: Add Memory Configuration Options for CI unit tests

- configured GitHub Actions workflows with configurable Node.js heap allocation, defaults to 6144 MiB
- added heap usage logging for memory monitoring and debugging
- increased Docker frontend build memory allocation to ensure consistent memory limits
- optimized Jest timeout for tokenSplit test

api/test/.env.test.example

@@ -11,3 +11,5 @@ OPENAI_API_KEY=your-api-key
 BAN_VIOLATIONS=true
 BAN_DURATION=7200000
 BAN_INTERVAL=20
+
+NODE_MAX_OLD_SPACE_SIZE=6144

api/test/jestSetup.js

@@ -16,3 +16,5 @@ process.env.ALLOW_EMAIL_LOGIN = 'true';
 // This can be overridden in individual tests if needed
 jest.setTimeout(30000);
 process.env.OPENAI_API_KEY = 'test';
+
+process.env.NODE_MAX_OLD_SPACE_SIZE = '6144';