Resolve contact names by MID, including non-friends

[kongesque]

When a group member is not in the friend list, applications only have the sender MID and cannot show the person's name. line contacts --mid MID now looks up supplied user IDs directly through GetContactsV2, including multiple IDs in one command. It preserves input order, reports omitted profiles explicitly, and leaves the existing friend-list output unchanged.

The change also rejects malformed contact responses, documents lookup and partial-result behavior, and updates the CLI guide and translated READMEs.

Validation: go test -race ./internal/... ./cmd/line ./pkg/line/... ./pkg/e2ee, go vet ./internal/... ./cmd/line ./pkg/line ./pkg/e2ee ./pkg, staticcheck ./internal/... ./cmd/line ./pkg/line ./pkg/e2ee ./pkg, ./build.sh, and command help checks passed. Tests use fake APIs; no live LINE request was made.

Closes #8

[coderabbitai]

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