[repo-assist] perf(query): normalize search terms once per query

[github-actions]

🤖 This is an automated change from Repo Assist.

Summary

Normalize multi-term search strings once before filtering AUR results instead of lowercasing each term for every package. This removes repeated allocations and work from the result loop while preserving matching behavior.

Rationale

AUR search filtering can process many results, so per-result term normalization scales unnecessarily with the number of packages. Precomputing the normalized terms makes the hot path perform only the package-field normalization and containment checks.

Trade-offs

The change adds one small normalized-term slice per search and keeps the existing filtering semantics unchanged.

Test Status

• go test ./pkg/query -count=1 passed.
• make build passed.
• make test is blocked by the environment: missing libalpm.so, pacman-conf, and the Go covdata tool.
• make lint is blocked because golangci-lint is unavailable.

Repo Assist leaves this draft for maintainer review.

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