feat: snow reports on TYPO3 13, with a page type for the static pages

The snow report list ("Schneehöhen" plugin) is ported from TYPO3 10:
SnowreportController, SnowreportRepository::getSnowreportsForRegions(),
the plugin registration with its flexform (regions) and the template,
which now formats dates with d.m.Y.

Page type 1705 (/<page>/snowreport) renders only the snow report plugins
of a page, like /form for forms. The static pages of the hybrid setup can
load it to replace the snow reports frozen at export time; each list
carries id="snowreport-<content uid>" for hx-select, since TYPO3 10 gives
the plugin no element of its own. ep:import-snowreport already flushes
the page cache after each import. The suffix is in the PageType enhancer
of every site with snow reports.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

feat: the snow report box includes the spacing of its content element

id="snowreport-<content uid>" moves from the list to a wrapper around
ep:container. The static pages of the hybrid setup no longer export the
snow reports at all, only an empty placeholder that loads the whole box,
spacing included, from /<page>/snowreport, so a page never shows
outdated snow depths.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/ep_theme/Configuration/TypoScript/Page/Snowreport.typoscript

@@ -0,0 +1,29 @@
+# The snow reports of a page without the page around them (/path/snowreport). The static pages of
+# the hybrid setup load this with htmx and replace the snow reports of the export with it: the
+# page URL itself is a static file that never reaches TYPO3, and the snow reports are imported
+# daily (ep:import-snowreport, which flushes the page cache). Each list carries
+# id="snowreport-<content uid>" (Templates/Snowreport/List.html) for hx-select.
+
+tx_eptheme_snowreport = PAGE
+tx_eptheme_snowreport {
+    typeNum = 1705
+    config {
+        disableAllHeaderCode = 1
+        disablePrefixComment = 1
+        additionalHeaders.10.header = Content-Type: text/html; charset=utf-8
+        additionalHeaders.20.header = X-Robots-Tag: noindex, nofollow
+        admPanel = 0
+        debug = 0
+    }
+
+    10 = CONTENT
+    10 {
+        table = tt_content
+        select {
+            where = {#CType} = 'list' AND {#list_type} = 'epproducts_snowreport_list'
+            orderBy = sorting
+        }
+        # Only the plugin: header and frame stay on the static page
+        renderObj =< tt_content.list.20.epproducts_snowreport_list
+    }
+}