Update CSV data fetching to use API endpoint in Mannschaften components

This commit modifies the loadMannschaften function across multiple components to fetch CSV data from the new API endpoint '/api/mannschaften' instead of the previous static file path '/data/mannschaften.csv'. This change enhances data retrieval consistency and aligns with the updated data management strategy in the application.

server/api/mannschaften.get.js

@@ -0,0 +1,58 @@
+import { promises as fs } from 'fs'
+import path from 'path'
+
+async function exists(p) {
+  try {
+    await fs.access(p)
+    return true
+  } catch {
+    return false
+  }
+}
+
+export default defineEventHandler(async (event) => {
+  try {
+    const cwd = process.cwd()
+    const filename = 'mannschaften.csv'
+
+    const candidates = [
+      path.join(cwd, '.output/public/data', filename),
+      path.join(cwd, 'public/data', filename),
+      path.join(cwd, '../.output/public/data', filename),
+      path.join(cwd, '../public/data', filename)
+    ]
+
+    let csvPath = null
+    for (const p of candidates) {
+      // eslint-disable-next-line no-await-in-loop
+      if (await exists(p)) {
+        csvPath = p
+        break
+      }
+    }
+
+    if (!csvPath) {
+      throw createError({
+        statusCode: 404,
+        statusMessage: 'Mannschaften-Datei nicht gefunden'
+      })
+    }
+
+    const csv = await fs.readFile(csvPath, 'utf-8')
+
+    setHeader(event, 'Content-Type', 'text/csv; charset=utf-8')
+    setHeader(event, 'Cache-Control', 'no-cache, no-store, must-revalidate')
+    setHeader(event, 'Pragma', 'no-cache')
+    setHeader(event, 'Expires', '0')
+
+    return csv
+  } catch (error) {
+    if (error?.statusCode) throw error
+    console.error('Fehler beim Laden der Mannschaften:', error)
+    throw createError({
+      statusCode: 500,
+      statusMessage: 'Fehler beim Laden der Mannschaften'
+    })
+  }
+})
+