fix: prevent memory leak in AllocationPriorityQueue with bounded map

- Add MAX_PROCESSING_TIMES_SIZE limit (10,000 entries) to processingTimes map
- Implement periodic cleanup of stale entries (5-minute interval)
- Add proper disposal with cleanup interval clearing
- Extract magic numbers into PRIORITY_QUEUE_DEFAULTS and PRIORITY_WEIGHTS
- Add ensureNotDisposed guard for all public methods
- Add Symbol.asyncDispose support for proper resource cleanup

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Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: DaMandal0rian