style: apply cargo fmt to dns, monitoring, optimizer, updater, diagnostics

[louzt]

Fix pre-existing formatting drift in 5 Rust files so CI fmt checks pass.

Files reformatted:

Deferred (separate issues): ,

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 26806a58-3c68-409c-94e4-6455e0d82a5a

📥 Commits

Reviewing files that changed from the base of the PR and between 5c46489 and 527f6b2.

📒 Files selected for processing (5)

• platforms/tauri/src-tauri/src/commands/diagnostics.rs
• platforms/tauri/src-tauri/src/commands/monitoring.rs
• platforms/tauri/src-tauri/src/commands/optimizer.rs
• platforms/tauri/src-tauri/src/commands/updater.rs
• platforms/tauri/src-tauri/src/services/dns.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/fmt-cleanup

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