refactor: move XML/RSS/sitemap routes to Trog::Routes::XML

[troglodyne-bot]

What

Move sitemap, RSS, and XSL stylesheet routes out of the 1667-line Trog::Routes::HTML module into a new Trog::Routes::XML module. Also fix Trog::Routes::TXT which had the wrong package declaration (Trog::Routes::JSON) and was never wired into TCMS.pm.

Why

Closes #293 — HTML.pm was acting as a catch-all for all content types. At 1667 lines, it was overdue for decomposition. XML/RSS routes are semantically distinct from HTML page routes.

Also fixes #321 — the sitemap index was calling $data->count() which counted all posts including private/unlisted ones, potentially generating empty sitemap pages. Now counts only public posts via $data->get(limit => 0, acls => ['public']).

How

• New Trog::Routes::XML module owns: sitemap, _rss, _post2rss, rss_style + their route entries
• Trog::Routes::HTML::posts() calls Trog::Routes::XML::_rss() for RSS format requests
• TCMS.pm now imports and merges %Trog::Routes::TXT::routes and %Trog::Routes::XML::routes
• Trog::Routes::XML::sitemap() references %Trog::Routes::HTML::routes directly for static route scanning (same package, no circular dep)
• HTML.pm shrinks from 1667 → 1390 lines

Testing

• Existing test suite passes (only pre-existing Trog-SQLite.t dbh mock failure, tracked in Add tests for core modules #332)
• Both new modules load cleanly under stub-dependency syntax check

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