Add default v5 client tag

[zhaohai666]

What is the purpose of the change

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Brief changelog

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Verifying this change

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[RockteMQ-AI]

Issue Evaluation

Category: enhancement | Status: Evaluated

Feature request to add a default tag for the v5 client in rocketmq-spring. This would simplify tag-based message filtering configuration.

Feasibility: feasible
Scope: rocketmq-spring-boot-starter, v5 client configuration
Compatibility: additive change, backward compatible

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Automated evaluation by github-manager-bot

[RockteMQ-AI]

Hi @zhaohai666, thanks for adding SQL92 filter support examples and default tag configuration.

A few things need attention:

1. PR description is incomplete — The template placeholders (XXXXX) haven't been filled in. Please update with details about what the change does and how to verify it.

2. This PR is 5 months old — Could you confirm this is still actively being worked on?

3. Mixed concerns — This PR adds both sample code (SQL92 examples) and core changes (default tag in RocketMQMessageListener). Consider splitting into separate PRs for easier review.

Please update the PR description and we can proceed with review.

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[RockteMQ-AI]

Summary

Sets sensible defaults for v5 client tag (* = subscribe all) and filter expression type (tag), and adds SQL92 filter consumer/producer examples. Clean improvement.

Observations

• [Info] Default tag change from empty to * is a good UX improvement — aligns with RocketMQ convention where * means "all tags".
• [Info] SQL92 examples are well-documented with clear configuration instructions.
• [Info] The SQL92ProducerApplication uses @SpringBootApplication as a standalone class rather than a sample within the existing demo app. This is fine for demonstration purposes.

LGTM — sensible defaults with helpful examples.

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