fix: resolve local plugin paths to absolute and enhance module replacement logic

[hgaol]

Fix #1519 .

works with below cmd.

build-local-vector-plugins:
	@cd new_answer/answer_with_plugin && \
	CGO_ENABLED=0 go build -o answer ./... && \
	ANSWER_MODULE=$$(pwd)/../../ ./answer build \
	  --with "github.com/apache/answer-plugins/vector-search-pgvector=$$(pwd)/../../../answer-plugins/vector-search-pgvector" \
	  --with "github.com/apache/answer-plugins/vector-search-elasticsearch=$$(pwd)/../../../answer-plugins/vector-search-elasticsearch" \
	  --with "github.com/apache/answer-plugins/vector-search-weaviate=$$(pwd)/../../../answer-plugins/vector-search-weaviate" \
	  --with "github.com/apache/answer-plugins/vector-search-milvus=$$(pwd)/../../../answer-plugins/vector-search-milvus" \
	  --with "github.com/apache/answer-plugins/vector-search-qdrant=$$(pwd)/../../../answer-plugins/vector-search-qdrant" \
	  --with "github.com/apache/answer-plugins/vector-search-chromadb=$$(pwd)/../../../answer-plugins/vector-search-chromadb" \
	  --with "github.com/apache/answer-plugins/vector-search-memory=$$(pwd)/../../../answer-plugins/vector-search-memory" \
	  --output ./new_answer_with_plugins