feat: add homepage components and API for settings and spielplan options

- Introduced new Vue components for homepage teasers: HomeLinksTeaser, HomeSpielplanTeamWidget, HomeTrainingTeaser, and HomeVereinsmeisterschaftenTeaser.
- Created XML layout for tablet app window dump.
- Implemented API endpoints for fetching and updating homepage settings.
- Added API for retrieving spielplan options, including team extraction logic.

server/api/homepage/spielplan-options.get.js

@@ -0,0 +1,61 @@
+import { listSpielplanSeasons, readSpielplanData, validateSeasonSlug } from '../../utils/spielplan-data.js'
+
+function teamLabel(teamName, teamAgeGroup) {
+  const name = String(teamName || '').trim()
+  const age = String(teamAgeGroup || '').trim()
+  if (!name) return ''
+  const isYouth = age.toLowerCase().includes('jugend') || name.toLowerCase().includes('jugend')
+  return isYouth ? `(J) ${name}` : name
+}
+
+function extractHarheimerTeams(rows) {
+  const seen = new Set()
+  const teams = []
+
+  const addTeam = (teamName, teamAgeGroup) => {
+    const name = String(teamName || '').trim()
+    if (!name) return
+    const age = String(teamAgeGroup || '').trim()
+    const key = `${name}||${age}`
+    if (seen.has(key)) return
+    seen.add(key)
+    teams.push({
+      key,
+      label: teamLabel(name, age),
+      teamName: name,
+      teamAgeGroup: age
+    })
+  }
+
+  for (const row of rows || []) {
+    if (String(row.HeimVereinName || '').trim() === 'Harheimer TC') {
+      addTeam(row.HeimMannschaft, row.HeimMannschaftAltersklasse)
+    }
+    if (String(row.GastVereinName || '').trim() === 'Harheimer TC') {
+      addTeam(row.GastMannschaft, row.GastMannschaftAltersklasse)
+    }
+  }
+
+  return teams.sort((a, b) => a.label.localeCompare(b.label, 'de'))
+}
+
+export default defineEventHandler(async (event) => {
+  const query = getQuery(event)
+  if (query.season && !validateSeasonSlug(query.season)) {
+    throw createError({
+      statusCode: 400,
+      message: 'Ungültiger Saison-Slug.'
+    })
+  }
+
+  const seasons = await listSpielplanSeasons()
+  const selectedSeason = String(query.season || seasons[0]?.slug || '')
+  const dataResult = await readSpielplanData(selectedSeason ? { season: selectedSeason } : {})
+
+  return {
+    success: true,
+    selectedSeason,
+    seasons,
+    teams: extractHarheimerTeams(dataResult.data)
+  }
+})