⚡ Bolt: Use borrowed BlockId in batch fetch

[ovasylenko]

💡 What:
Updated the Storage trait's get_block_outputs_batch signature from keys: &[(InstanceId, BlockId)] to keys: &[(InstanceId, &BlockId)]. Also updated the corresponding implementations in Postgres, SQLite, and Encrypting decorators, and replaced .clone() calls in the scheduler's deadline iteration hot-path with borrowing logic.

🎯 Why:
To prevent allocating hundreds or thousands of Strings per tick. When preparing batch fetches for block outputs (especially related to SLAs/deadlines), the engine was mapping through sequence definitions and deeply cloning the BlockId strings just to fulfill the trait's parameter type.

📊 Impact:
Removes 1 heap allocation per block instance evaluation in the scheduler's deadline_keys collection logic, reducing GC/allocator pressure in the hot loop.

🔬 Measurement:
Run cargo run -p orch8-engine under a profiler (like flamegraph) or load testing scenario. The time spent in memory allocation within the scheduler loop (specifically related to building the deadline_keys vector) should be measurably reduced. Validated correctness via cargo clippy -p orch8-storage -p orch8-engine and cargo test -p orch8-engine --lib scheduler::tests.

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PR created automatically by Jules for task 6193250396225194741 started by @ovasylenko

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