fix(storage): avoid panic for overlong path prefixes

[QuantumExplorer]

Summary

• keep the legacy prefix body unchanged for valid <=255-byte path segments
• route overlong path segments through a separate length-delimited prefix body before hashing
• update prefix tests so 256-byte segments no longer panic and max-size valid segments retain legacy layout

Fixes #680.

Notes

Storage context construction currently returns CostContext, not CostResult, so this avoids the process abort without a broad storage-trait API change.

Verification

• cargo test -p grovedb-storage --features rocksdb_storage test_build_prefix
• cargo test -p grovedb-storage --features rocksdb_storage

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7652b633-575b-49b6-9b90-95bd2bde9c37

📥 Commits

Reviewing files that changed from the base of the PR and between 60f2968 and ecf66df.

📒 Files selected for processing (1)

• storage/src/rocksdb_storage/storage.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-680-overlong-path-prefix

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.42%. Comparing base (60f2968) to head (ecf66df).
⚠️ Report is 3 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #727   +/-   ##
========================================
  Coverage    91.42%   91.42%           
========================================
  Files          236      236           
  Lines        67053    67069   +16     
========================================
+ Hits         61305    61321   +16     
  Misses        5748     5748           

Components	Coverage Δ
grovedb-core	88.94% <ø> (ø)
merk	92.26% <ø> (ø)
storage	86.51% <100.00%> (+0.14%)	⬆️
commitment-tree	96.43% <ø> (ø)
mmr	96.76% <ø> (ø)
bulk-append-tree	89.26% <ø> (ø)
element	97.36% <ø> (ø)

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