fix(nextcloud): Database corruption recovery and conservative Apache tuning

- Restored clean SQLite database from pre-migration backup
- Fixed severe database corruption (rowid ordering, page corruption, index issues)
- Applied conservative MaxRequestWorkers=15 for SQLite stability
- Database integrity now perfect, all health checks passing
- Ready for future MySQL migration with clean data

[ci skip]

stacks/nextcloud/main.tf

@@ -93,15 +93,15 @@ resource "kubernetes_config_map" "apache_tuning" {
   }
   data = {
     "mpm_prefork.conf" = <<-EOF
-      # Tuned for container with 4 CPU and 3Gi memory limit using Redis + SQLite
+      # Conservative SQLite-safe configuration (post-database restoration)
-      # Each worker uses ~80-120MB RSS. 25 workers = ~2.5GB max (fits in 3Gi limit)
+      # Balance between avoiding health check timeouts and preventing SQLite lock contention
-      # Higher count handles concurrent users and prevents health check timeouts
+      # 15 workers = safe concurrency for SQLite while handling multiple users + health checks
       <IfModule mpm_prefork_module>
-        StartServers            5
+        StartServers            4
-        MinSpareServers         3
+        MinSpareServers         2
-        MaxSpareServers         8
+        MaxSpareServers         6
-        MaxRequestWorkers       25
+        MaxRequestWorkers       15
-        MaxConnectionsPerChild  200
+        MaxConnectionsPerChild  150
       </IfModule>
     EOF
   }