feat(admin): LicServer config manageable via admin settings UI

- Migration: add licserver_base_url/api_key cols to settings table
- New: lib/actions/licserver-config.ts (read/write/test server actions)
- Updated: proxy routes read config from DB with env-var fallback
- Updated: admin/einstellungen adds LicServer card with URL + API key
  input, show/hide toggle, Save and Connection Test buttons

shop/app/api/licserver/partners/route.ts

@@ -1,10 +1,8 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { createClient } from '@/lib/supabase/server'
+import { getLicServerConfig } from '@/lib/actions/licserver-config'
 import type { PartnerDtoPagedResult, LicServerProblemDetails } from '@/lib/types/licserver'
 
-const LICSERVER_BASE_URL = process.env.LICSERVER_BASE_URL
-const LICSERVER_API_KEY  = process.env.LICSERVER_API_KEY
-
 /**
  * GET /api/licserver/partners
  *
@@ -12,7 +10,8 @@ const LICSERVER_API_KEY  = process.env.LICSERVER_API_KEY
  * Query params forwarded: search, page, pageSize
  *
  * Secured: requires a valid Supabase session.
- * The X-Api-Key is injected server-side and never exposed to the browser.
+ * base_url + api_key are read from DB settings (admin-configurable),
+ * with fallback to LICSERVER_BASE_URL / LICSERVER_API_KEY env vars.
  */
 export async function GET(req: NextRequest) {
   // ── Auth guard ─────────────────────────────────────────────────────────
@@ -22,18 +21,19 @@ export async function GET(req: NextRequest) {
     return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
   }
 
-  // ── Env check ──────────────────────────────────────────────────────────
-  if (!LICSERVER_BASE_URL || !LICSERVER_API_KEY) {
-    console.error('[licserver] LICSERVER_BASE_URL or LICSERVER_API_KEY not set')
+  // ── Load config from DB (falls back to env vars) ──────────────────────
+  const cfg = await getLicServerConfig()
+  if (!cfg.base_url || !cfg.api_key) {
+    console.error('[licserver] base_url or api_key not configured (DB or env)')
     return NextResponse.json(
-      { error: 'LicServer not configured' },
+      { error: 'LicServer nicht konfiguriert. Bitte in den Admin-Einstellungen hinterlegen.' },
       { status: 503 }
     )
   }
 
   // ── Forward query params ───────────────────────────────────────────────
   const { searchParams } = req.nextUrl
-  const upstream = new URL(`${LICSERVER_BASE_URL}/api-v1/partners`)
+  const upstream = new URL(`${cfg.base_url}/api-v1/partners`)
   const search   = searchParams.get('search')
   const page     = searchParams.get('page')
   const pageSize = searchParams.get('pageSize')
@@ -46,7 +46,7 @@ export async function GET(req: NextRequest) {
     const res = await fetch(upstream.toString(), {
       method:  'GET',
       headers: {
-        'X-Api-Key': LICSERVER_API_KEY,
+        'X-Api-Key': cfg.api_key,
         'Accept':    'application/json',
       },
       // Internal container network — short timeout