Add autocomplete status check and restructure test environments

Add Ollama autocomplete status endpoint to AI routes, update sync panel
UI to display autocomplete state, replace monolithic test compose files
with separate Linux/Windows variants, and add PowerShell build script
for Windows deployment

frontend/style.css

@@ -4239,16 +4239,23 @@ body.resizing-v {
   padding: 10px 14px;
 }
 
-.sync-panel__ai-header {
-  display: flex;
-  align-items: center;
-  justify-content: space-between;
-}
-
 .sync-panel__ai-title {
   font-size: 0.78rem;
   font-weight: 600;
   color: var(--text-primary);
+  margin-bottom: 8px;
+}
+
+.sync-panel__ai-row {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-top: 5px;
+}
+
+.sync-panel__ai-label {
+  font-size: 0.72rem;
+  color: var(--text-muted);
 }
 
 .sync-panel__ai-state {