feat(zerozone2): add overload protection

[superhx]

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[Copilot]

Pull Request Overview

This PR adds overload protection mechanisms to the zerozone2 system to handle high load scenarios more gracefully. The changes introduce queue-based capacity limits, timeout-based task dropping, and retry logic for capacity-constrained operations.

Key changes:

• Replaces Semaphore-based inflight limiting with BlockingQueue and timeout-based overload detection in SnapshotReadCache
• Adds blocking queues with capacity limits to RouterInV2 and implements retry logic for queue insertion
• Implements infinite retry with sleep for OverCapacityException in ObjectRouterChannel
• Adds exception handling for proxy operations in RouterOutV2
• Adjusts resource cleanup timing in DefaultLinkRecordDecoder

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
s3stream/src/main/java/com/automq/stream/s3/cache/SnapshotReadCache.java	Implements queue-based overload protection with timeout detection and task dropping mechanism
core/src/main/java/kafka/automq/zerozone/RouterOutV2.java	Adds exception handling with proper error responses for failed proxy operations
core/src/main/java/kafka/automq/zerozone/RouterInV2.java	Replaces unbounded queue with bounded BlockingQueue and adds blocking put with retry loop
core/src/main/java/kafka/automq/zerozone/ObjectRouterChannel.java	Implements synchronous retry loop with sleep for handling capacity exceptions
core/src/main/java/kafka/automq/zerozone/DefaultLinkRecordDecoder.java	Moves resource release from finally block to async callback for consistency

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