Replace jsoup with ksoup for HTML parsing

[andrikeev]

Summary

Replaces jsoup with ksoup (com.fleeksoft.ksoup), a Kotlin Multiplatform port of jsoup, and removes jsoup entirely from the project.

Changes

• Version catalog (gradle/libs.versions.toml): drop jsoup 1.22.2, add ksoup 0.2.6.
• Dependencies: switch libs.jsoup → libs.ksoup in :core:network:rutracker and :proxy.
• Source (:core:network:rutracker parsers, 12 files):
  • org.jsoup.* → com.fleeksoft.ksoup.* imports.
  • Jsoup.parse(...) → Ksoup.parse(...).
  • Two small API differences adapted in ParsePostUseCase:
    • Tag.name (property) → Tag.name() (function)
    • TextNode.wholeText (property) → TextNode.getWholeText() (function)

The rest of the jsoup API (select, selectFirst, first/last, attr, text, hasClass, children, childNodes, remove, …) is identical in ksoup, so the parsing logic is otherwise untouched.

Behaviour compatibility

The main risk in this swap is Elements.first() / last(): the parsers rely on jsoup's null-on-empty semantics (rather than Kotlin's List.first(), which throws). Verified that ksoup's Nodes declares its own first()/last() members returning a nullable Element? (bytecode shows return null when empty), so behaviour is preserved.

Local verification

• ./gradlew :core:network:rutracker:compileKotlin — ✅ compiles clean (the jsoup jspecify nullability warnings are also gone, since ksoup is pure Kotlin).
• Temporary runtime smoke test (removed before commit) exercising Ksoup.parse, CSS selection, first()-null-on-empty, ParseTorrentStatusUseCase, and ParsePostUseCase (text/<br>/bold → getWholeText() + tag().name() paths) — all passed.
• grep confirms zero remaining jsoup references.

Note: the full Android app build (:app:assembleDebug / lintDebug / testDebugUnitTest) was not run locally — it requires the Android SDK and the google-services.json secret, which aren't available in this environment. The change is contained to :core:network:rutracker (the only module that referenced jsoup) and its public API is unchanged, so downstream modules are unaffected at the source level. ksoup officially supports Android and pulls only small, pure-Kotlin, Android-safe transitive deps.

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https://claude.ai/code/session_01EPxhiZbmURTJvhRzAHcpGu

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