feat(ollama): configure environment variables for ollama service

- Updated `services.ollama` to include `environmentVariables` object
- Configured `OLLAMA_ORIGINS`, `OLLAMA_FLASH_ATTENTION`, and `OLLAMA_NUM_PARALLEL` variables
- Changed the value of `OLLAMA_NUM_PARALLEL` to "2" from "3"

hosts/architect/llm.nix

@@ -11,11 +11,6 @@ in
 {
   environment = {
     systemPackages = [ ollamaPkg ];
-    variables = {
-      OLLAMA_ORIGINS = "*";
-      OLLAMA_FLASH_ATTENTION = "1";
-      OLLAMA_NUM_PARALLEL = "3";
-    };
   };
 
   services.ollama = {
@@ -24,6 +19,11 @@ in
     enable = true;
     acceleration = "cuda";
     package = ollamaPkg;
+    environmentVariables = {
+      OLLAMA_ORIGINS = "*";
+      OLLAMA_FLASH_ATTENTION = "1";
+      OLLAMA_NUM_PARALLEL = "2";
+    };
   };
 
   architect.vhost.${frontendDomain} = {