refactor(ai-frontend): Improve Nomad job configuration and clarity

*   Reformatted the `resources` block for the `openwebui` group to a multi-line format to resolve an illegal semicolon syntax issue.
*   Added explicit comments to both `openwebui` and `lobechat` groups to clarify the host pinning constraint.
*   Streamlined comments in the `lobechat` group's `resources` block to concisely state the memory allocation, removing outdated "fix" comments and adding a current "FIXED" comment.

These changes enhance the readability, maintainability, and correctness of the Nomad job definition.

stacks/ai/ai-frontend.nomad

@@ -3,10 +3,11 @@ job "ai-frontend" {
   region      = "home"
   type        = "service"
 
-  # --- OpenWebUI (Keep as is) ---
+  # --- OpenWebUI ---
   group "openwebui" {
     count = 1
 
+    # Pin to HP1
     constraint {
       attribute = "${attr.unique.hostname}"
       value     = "hp-mini-1" 
@@ -46,14 +47,19 @@ job "ai-frontend" {
         ]
       }
       
-      resources { cpu = 1000; memory = 1024 }
+      # FIXED: Expanded to multi-line to remove illegal semicolon
+      resources { 
+        cpu    = 1000
+        memory = 1024 
+      }
     }
   }
 
-  # --- LobeChat (UPDATED) ---
+  # --- LobeChat ---
   group "lobechat" {
     count = 1
     
+    # Pin to HP1
     constraint {
       attribute = "${attr.unique.hostname}"
       value     = "hp-mini-1"
@@ -91,10 +97,9 @@ job "ai-frontend" {
         ports = ["http"]
       }
       
+      # FIXED: Ensure 1GB RAM to prevent OOM
       resources {
         cpu    = 500
-        # --- THE FIX ---
-        # Increased from 512 to 1024 to prevent OOM crashes
         memory = 1024 
       }
     }