Add script for importing match schedule and logging

- Created `import-spielplan.js` to fetch and parse the match schedule from the specified URL, saving the output as JSON.
- Added `run-spielplan-import.sh` to automate the execution of the import script and log output.
- Introduced `spielplan.html` file to store the downloaded HTML content for further processing.

server/api/spielplan/seasons.get.js

@@ -0,0 +1,24 @@
+import { getCurrentSeasonSlug, listSpielplanSeasons } from '../../utils/spielplan-data.js'
+
+export default defineEventHandler(async () => {
+  try {
+    const seasons = await listSpielplanSeasons()
+    const currentSeason = getCurrentSeasonSlug()
+    const defaultSeason = seasons.find((season) => season.slug === currentSeason)?.slug || seasons[0]?.slug || null
+
+    return {
+      success: true,
+      seasons,
+      currentSeason,
+      defaultSeason
+    }
+  } catch (error) {
+    console.error('Fehler beim Laden der Spielplan-Saisons:', error)
+    return {
+      success: false,
+      seasons: [],
+      currentSeason: getCurrentSeasonSlug(),
+      defaultSeason: null
+    }
+  }
+})