fix(index): add MAX_SEARCH_SIZE bounds to prevent OOM

[poyrazK]

Summary

• Clamp size and from in search() to MAX_SEARCH_SIZE (10,000) and MAX_SEARCH_OFFSET (1,000,000) to prevent OOM from unbounded result allocation
• Add validation in validate_search_request() to fail fast on requests exceeding limits
• Without this, a client could request size: 100_000_000 and exhaust server memory
• Fixes search: unbounded __TEXT __DATA __OBJC others dec hex parameter allows OOM via large result allocation #83

Test plan

• cargo test --package cloudsearch-index — all 84 tests pass
• cargo test --package cloudsearch-api — all 24 tests pass
• cargo clippy --workspace --all-targets -- -D warnings -D clippy::pedantic — clean

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ℹ️ Review info

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Configuration used: defaults

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Run ID: cd8808de-c825-48b5-9a54-158329edeea7

📥 Commits

Reviewing files that changed from the base of the PR and between 244956f and ea9a385.

📒 Files selected for processing (2)

• rust/crates/cloudsearch-index/src/lib.rs
• rust/crates/cloudsearch-index/tests/coverage.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/search-size-bounds

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[poyrazK]

It's okay to merge