[BLOCKED on backend#13] feat: license from backend + Recently Released search sort

[rainxchzed]

DO NOT MERGE until OpenHub-Store/backend#13 deploys to production. Verification command for live check:

```
curl -s https://api.github-store.org/v1/repo/microsoft/vscode | jq '.license, .openIssuesCount'
```

Should print a non-null `license` object. Once green, this PR is safe to merge.

Stacks on top of #520 (Recently Updated sort). Merge order: 520 → main → this PR.

Summary

Consumes the two new backend additions from backend#13:

1. Nested `license: { spdxId, name } | null` field on `/v1/repo` (and every other RepoResponse-shaped endpoint).
2. New search sorts `sort=updated` (repo activity) and `sort=releases` (latest release date).

Client changes

• `BackendRepoResponse` gains `BackendLicense` nested DTO + `license: BackendLicense?` field.
• `DetailsRepositoryImpl.getRepoStats` reads `backendRepo.license?.spdxId ?: backendRepo.license?.name` directly. Drops the entire `hasToken` + GitHub enrichment block (was 1 quota hit per signed-in user per Details open). Stale-cache fallback narrowed away. `tokenStore` ctor param + Koin wire dropped.
• `RepoStats` cache key bumped `v2` → `v3` so post-deploy fetches don't serve old `license=null` entries from before this change. `refreshRepository` invalidate path bumped to match.
• `SearchRepositoryImpl.tryBackendSearch` drops the `RecentlyUpdated` skip guard. Backend sort map gains `updated` and `releases`.
• Domain `SortBy` adds `RecentlyReleased` (GitHub fallback borrows `updated` semantics — closest available approximation when backend is unreachable). UI mirror `SortByUi.RecentlyReleased` + mapper + label.
• New `sort_recently_released` string in all 13 locales (alongside existing `sort_recently_updated`).
• 1.8.1 what's-new bullets updated across all 13 locales: search bullet now mentions both Recently Updated + Recently Released; new IMPROVED bullet for license sourced from backend.

Quota economics

Flow	Before	After
Anon Details open	1 backend hit	1 backend hit
Signed-in Details open	1 backend + 1 GitHub	1 backend
Recently Updated search	1 GitHub direct (per page)	1 backend (per page)
Recently Released search	n/a (didn't exist)	1 backend (per page)

Net: GitHub quota for Details + sorted Search drops to ~0 for typical usage.

Test plan (post-deploy)

• curl confirms backend serves `license` field on a known repo (e.g. `microsoft/vscode` → `{ spdxId: "MIT", name: "MIT License" }`).
• Open Details on signed-in account → license shown, no GitHub direct call in network log.
• Open Details signed-out → license shown (was missing pre-PR).
• Search → Sort sheet shows 5 options including Recently Released. Picking it returns repos ordered by latest release date.
• Picking Recently Updated returns same data via backend (no GitHub direct call in log).
• What's-new sheet on next 1.8.1 install shows the updated bullets in device language.

Summary by CodeRabbit

• New Features
  • License information now displayed for every repository regardless of sign-in status
  • Search results can be sorted by "Recently Released" in addition to existing sort options
  • Open issue counts now visible to all users, including those not signed in

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