chore: prepare dyns v0.7.0-beta.1

[eareimu]

Summary

Prepare dyns v0.7.0-beta.1 with typed endpoint sequence selection and Primary-sequence publication/routing.

This branch is rebased on main after PR #11 was merged first. The deprecated feat/optional-netwatcher branch is not included.

Changes

• Add typed endpoint lookup modes for default, exact sequence, finite sequence count, and all sequences, with an independent record limit.
• Preserve server-ranked Primary sequence ordering across H3, HTTP, mDNS, and aggregate resolvers.
• Publish Primary sequence metadata from publisher-owned endpoint authority.
• Keep modern and legacy endpoint records unambiguous.
• Keep no-feature package verification independent of the optional url dependency.

Version rationale

cargo-semver-checks found intentional breaking public API changes relative to dyns v0.6.0-beta.3, including the new lookup request parameter and the publisher-owned mDNS authority API. Because this is a 0.x crate, the release moves to the 0.7.0 prerelease line rather than using a prerelease patch increment.

Verification

• RUSTFLAGS="-D warnings" cargo +nightly check --no-default-features
• cargo +nightly fmt -- --check
• cargo +nightly clippy --all-targets --all-features -- -D warnings
• cargo +nightly test --all-features --all-targets
• cargo +nightly publish --dry-run --allow-dirty
• cargo +1.92.0 semver-checks check-release -p dyns --baseline-version 0.6.0-beta.3 --all-features

Proposed annotated tag message

# dyns v0.7.0-beta.1

## Changes

- Add typed endpoint lookup selection for the default Primary sequence, an exact sequence, a finite sequence count, or all Primary sequences.
- Keep record limits independent from sequence selection.
- Preserve server-ranked Primary sequence ordering across H3, HTTP, mDNS, and aggregate resolution.
- Publish Primary sequence metadata from publisher-owned endpoint authority.
- Disambiguate modern and legacy endpoint records.
- Preserve full-cone endpoint publication and ordered candidate behavior merged through PR #11.

## Published crate

- `dyns` v0.7.0-beta.1 (library target `ddns`)