fix(server): Mono.subscribe() should be called explicitly

Author: codeboyzhou

src/main/java/com/github/codeboyzhou/mcp/declarative/server/factory/McpServerPromptFactory.java

@@ -73,7 +73,7 @@ public void registerTo(McpAsyncServer server) {
                 queue.submit(prompt);
             }
         }
-        queue.consume(server::addPrompt);
+        queue.consume(prompt -> server.addPrompt(prompt).subscribe());
     }
 
     private List<McpSchema.PromptArgument> createPromptArguments(Method method) {

src/main/java/com/github/codeboyzhou/mcp/declarative/server/factory/McpServerResourceFactory.java

@@ -66,7 +66,7 @@ public void registerTo(McpAsyncServer server) {
                 queue.submit(resource);
             }
         }
-        queue.consume(server::addResource);
+        queue.consume(resource -> server.addResource(resource).subscribe());
     }
 
 }

src/main/java/com/github/codeboyzhou/mcp/declarative/server/factory/McpServerToolFactory.java

@@ -80,7 +80,7 @@ public void registerTo(McpAsyncServer server) {
                 queue.submit(tool);
             }
         }
-        queue.consume(server::addTool);
+        queue.consume(tool -> server.addTool(tool).subscribe());
     }
 
     private McpSchema.JsonSchema createJsonSchema(Method method) {