List C, C++ and Objective-C packages on ViGet instead of Tala

Tala and its tools are no longer developed as of 2026-11-10; Progmasoft
puts its work into Tazel, a build system for C, C++, Objective-C,
Objective-C++ and Zig. ViGet follows:

- /langs/tala is removed. /langs/c, /langs/cpp and /langs/objc are the
  language catalogs (Objective-C++ packages belong to /langs/objc), served
  by one page, app/viget/langs/[language], which knows only these three;
  any other language is 404. /langs leads to the language list on the
  ViGet home page.
- lib/viget-catalogs.ts: three open language catalogs with their own
  title, description and empty state in en-US, de-DE, ru-RU and he-IL; the
  Tazel catalog describes Tazel as the build system for C, C++,
  Objective-C, Objective-C++ and Zig.
- The ViGet home, header, footer and metadata name C, C++ and Objective-C;
  "Explore Tala" becomes "Explore Tazel" (tazel.net), and the footer links
  Tazel instead of Tala. The sitemap lists the three catalogs.
- Tests: the catalogs, their texts in every language, no text naming Tala,
  and the proxy routes.

pnpm test (37), lint, check and build pass; next start answers /langs/c,
/langs/cpp and /langs/objc with their pages, /langs/tala and /langs/zig
with 404, and /langs with 308 to the language list.

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