Add Simplified Chinese (zh-rCN) translations

[Llhhy1]

Proposed change

Adds Simplified Chinese (values-zh-rCN) translations.

• values-zh-rCN/strings.xml — 879 strings + 7 plurals as a pure overlay. English remains the default locale, so no behavior change for existing users. Android 13+ gets a per-app language entry automatically from the resource table; Android 12 follows the system locale. No Kotlin UI code or manifest changes were needed.
• values/strings.xml — removed translatable="false" from the 618 user-facing strings that are now translated, and added four unit_* labels. No existing text was modified: the diff on existing lines is attribute removals only. Those strings are rendered in the Settings cards, dialogs and log rows, so the flag looked like leftover from the original sample project; keeping it produces 618 Untranslatable warnings once a locale folder exists, and it keeps the strings invisible to translation tooling.
• SettingRenderers.kt (6 lines) — the duration dropdowns used their stored logic key as the visible label, so 检查频率 rendered days in every language. Labels now come from unit_seconds/minutes/hours/days; the persisted value and the toBaseUnit/fromBaseUnit converters are untouched, so existing preferences keep working.
• Per-flavor values-zh-rCN with app_label so MissingTranslation stays clean for the dev/beta/stable source sets.
• Left in English on purpose (31 entries): brand names, unit formats (%1$dms, t/s), sampler parameter names (temperature, top_p, top_k, max_tokens, which mirror the API fields), and input placeholders (hf_…, 8000, IP/CIDR examples).

String names, format placeholders and \n / \u0020 escapes are asserted identical to values/strings.xml by script, so nothing drifts and the concatenated log fragments (logs_event_*) keep their surrounding spaces.

Verification

• ./gradlew :app:lintStableDebug → 0 errors, 46 warnings — identical to the baseline without the locale folder.
• aapt2 dump resources on the built APK → default config still Start Server, zh-rCN config returns 启动服务器.
• Installed on a real arm64 phone and reviewed screen by screen (that is how the days dropdown bug surfaced).

Process: translations were drafted with AI assistance, then reviewed entry by entry against the running app.

Screenshots

Settings	Status	Models

_{Images are hosted from a zh-screenshots branch of my fork so they stay out of this diff.}

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements or tests
• Dependency upgrade
• Documentation

Additional information

• This PR fixes or closes issue: closes Add Simplified Chinese (zh-Hans) locale? #48
• Happy to split the translatable="false" removal or the unit-dropdown fix into separate PRs if that reviews better.

Checklist

• The code compiles without errors (./gradlew :app:compileStableDebugKotlin)
• The change is tested and works locally on a real device or emulator
• No new warnings from ./gradlew lint
• There is no commented out code in this PR
• Existing functionality is not broken

[Llhhy1]

Friendly nudge — no rush at all, I know this is a solo side project.

Two things I can do to make review easier whenever you get to it:

1. Split it up: (a) values-zh-rCN overlay + per-flavor app_label, (b) the translatable="false" removals, (c) the 6-line unit-dropdown label fix — three small PRs instead of one.
2. Shrink it: drop the translatable="false" removals entirely and ship a locale covering only the ~270 currently-translatable strings. Smaller diff, but the Settings screen would stay partly English.

Also FYI: CI hasn't run yet, presumably because workflow runs need approval for a first-time contributor's fork PR. And I'm happy to rebase if main moves ahead.

Whatever you prefer — including "not right now". Thanks for the app either way.