fix(rag): fix rag hook not work and add log for bailian rag fails

[shiyiyue1102]

Change-Id: I5f5709dd126491e2626740dc538f4c915b0c6ba5

AgentScope-Java Version

[The version of AgentScope-Java you are working on, e.g. 1.0.6, check your pom.xml dependency version or run mvn dependency:tree | grep agentscope-parent:pom(only mac/linux)]

Description

1. fix rag hook not working
2. remove enableOnlyForUserQueries，it make no sense
3. optimize logs of bai lian rag client

Checklist

Please check the following items before code is ready to be reviewed.

• Code has been formatted with mvn spotless:apply
• All tests are passing (mvn test)
• Javadoc comments are complete and follow project conventions
• Related documentation has been updated (e.g. links, examples, etc.)
• Code is ready for review

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[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...in/java/io/agentscope/core/rag/GenericRAGHook.java	25.00%	3 Missing ⚠️

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