Add admin port support with other major refactorations

.github/workflows/ci.yml

@@ -51,4 +51,10 @@ jobs:
         # We run tests and fail if coverage is below 100%.
         # E2E test is skipped in CI because no local OpenTTD server is available.
         run: |
-          pytest --cov=openttd --cov-report=term-missing --cov-fail-under=100 -k "not test_server_connection_and_join" tests/
+          pytest --cov=openttd --cov-report=term-missing --cov-fail-under=100 -m "not e2e" tests/
+      
+      - name: Verify Public API E2E Call Constraints
+        env:
+          PYTHONPATH: lib
+        run: |
+          python check_public_calls.py