fix: validate every Lite consumer subscription against its bound topic [fj4WqyCCw3C5ShR1RfB7MoBPTpkRrBFYP1uT35g3MvT]

[waterWang]

What

ClientProcessor.validateLiteSubTopic now validates every subscription in the set against the group's bound topic, not just the first element.

Why

ClientProcessor.validateLiteSubTopic called subList.iterator().next().getTopic(), which only checks the first element of the subscription set. A Lite consumer group with a configured liteBindTopic could include a second subscription for a different topic without being rejected.

How

• Changed the single-element check to a for loop over all elements
• Added testValidateLiteSubTopic_mismatchedSecondTopic_throwsException to verify that a mismatching second subscription triggers ILLEGAL_TOPIC

Fixes #10895

[RockteMQ-AI]

Summary

Fixes a validation bypass in ClientProcessor.validateLiteSubTopic where only the first subscription in the set was checked against the bound topic. The change correctly iterates over all subscriptions and adds a test case for the second-element mismatch scenario.

Clean, focused fix with proper test coverage. LGTM.

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