feat: complete MDX migration, stabilize environment & verify via E2E tests

Former-commit-id: ec3e64156a2e182535cbdcf0d975cd54603a517d

app/api/health/cms/route.ts

@@ -1,41 +0,0 @@
-import { NextResponse } from 'next/server';
-import { getPayload } from 'payload';
-import configPromise from '@payload-config';
-
-export const dynamic = 'force-dynamic';
-
-/**
- * Deep CMS Health Check
- * Validates that Payload CMS can actually query the database.
- * Used by post-deploy smoke tests to catch migration/schema issues.
- */
-export async function GET() {
-  const checks: Record<string, string> = {};
-
-  try {
-    const payload = await getPayload({ config: configPromise });
-    checks.init = 'ok';
-
-    // Verify each collection can be queried (catches missing locale tables, broken migrations)
-    const collections = ['posts', 'pages', 'media', 'competences'] as const;
-    for (const collection of collections) {
-      try {
-        await payload.find({ collection, limit: 1 });
-        checks[collection] = 'ok';
-      } catch (e: any) {
-        checks[collection] = `error: ${e.message?.substring(0, 100)}`;
-      }
-    }
-
-    const hasErrors = Object.values(checks).some((v) => v.startsWith('error'));
-    return NextResponse.json(
-      { status: hasErrors ? 'degraded' : 'ok', checks },
-      { status: hasErrors ? 503 : 200 },
-    );
-  } catch (e: any) {
-    return NextResponse.json(
-      { status: 'error', message: e.message?.substring(0, 200), checks },
-      { status: 503 },
-    );
-  }
-}