Resolve linker error in test_filter_chain_assembler

Add missing gopher-mcp-logging library to test_filter_chain_assembler
target. The filter_chain_assembler.cc uses mcp::logging::LoggerRegistry
methods which require linking against the logging library.

Author: RahulHere

tests/filter/CMakeLists.txt

@@ -318,6 +318,7 @@ add_executable(test_filter_chain_assembler
 target_link_libraries(test_filter_chain_assembler
   PRIVATE
   gopher-mcp
+  gopher-mcp-logging
   gtest
   gtest_main
   gmock