fix: persist OpenRouter API key on save + bump v16.19.0

The ai_save_config handler was missing the openrouter_api_key field,
so the key was never written to disk. Added the missing block.

Author: Paul C

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "wolfstack"
-version = "16.18.0"
+version = "16.19.0"
 edition = "2024"
 authors = ["Wolf Software Systems Ltd"]
 description = "Server management platform for the Wolf software suite"

src/api/mod.rs

@@ -4842,6 +4842,11 @@ pub async fn ai_save_config(
                 config.gemini_api_key = v.to_string();
             }
         }
+        if let Some(v) = body.get("openrouter_api_key").and_then(|v| v.as_str()) {
+            if !v.contains("••••") && !v.is_empty() {
+                config.openrouter_api_key = v.to_string();
+            }
+        }
         if let Some(v) = body.get("model").and_then(|v| v.as_str()) {
             config.model = v.to_string();
         }