style: clean clippy lints in did-stellar-registry

[aguilar1x]

Summary

Clears the pre-existing clippy debt in did-stellar-registry so the crate passes clippy -D warnings. No behavior change — purely lint fixes (mostly applied via cargo clippy --fix).

• manual_range_contains: key-count bound check rewritten with RangeInclusive::contains.
• len_zero: len() == 0 → is_empty() in service validation.
• bool_assert_comparison: assert_eq!(x, true/false) → assert!(x) / assert!(!x) in tests.
• manual_str_repeat / manual_repeat_n: long-string test builders → str::repeat.
• needless_borrow: dropped a redundant &.
• duplicated_attributes: removed the redundant inner #![cfg(test)] (the module is already #[cfg(test)]-gated in lib.rs).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f22970be-f518-4cf0-9f0c-fd47e62649c1

📥 Commits

Reviewing files that changed from the base of the PR and between 872d942 and 3285e37.

📒 Files selected for processing (2)

• contracts/did-stellar-registry/src/contract.rs
• contracts/did-stellar-registry/src/test.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/registry-clippy

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