fix: increase memory limits for OOMKilled pods (immich, clickhouse, speedtest)

- immich-server: limits 1700Mi → 2500Mi (70 restarts from media processing spikes)
- clickhouse: limits 1Gi → 1536Mi, max_server_memory_usage 800Mi → 1200Mi
- speedtest: limits 256Mi → 512Mi, requests 256Mi → 128Mi (daily OOM during test)

stacks/immich/main.tf

@@ -287,7 +287,7 @@ resource "kubernetes_deployment" "immich_server" {
               memory = "1700Mi"
             }
             limits = {
-              memory = "1700Mi"
+              memory = "2500Mi"
             }
           }
         }

stacks/rybbit/main.tf

@@ -78,7 +78,7 @@ resource "kubernetes_config_map" "clickhouse_memory" {
   data = {
     "memory.xml" = <<-EOF
       <clickhouse>
-          <max_server_memory_usage>838860800</max_server_memory_usage>
+          <max_server_memory_usage>1258291200</max_server_memory_usage>
       </clickhouse>
     EOF
   }
@@ -169,7 +169,7 @@ resource "kubernetes_deployment" "clickhouse" {
               memory = "1Gi"
             }
             limits = {
-              memory = "1Gi"
+              memory = "1536Mi"
             }
           }
         }

stacks/speedtest/main.tf

@@ -157,10 +157,10 @@ resource "kubernetes_deployment" "speedtest" {
           resources {
             requests = {
               cpu    = "25m"
-              memory = "256Mi"
+              memory = "128Mi"
             }
             limits = {
-              memory = "256Mi"
+              memory = "512Mi"
             }
           }
           volume_mount {