fix: sort list_all() output in ToolRouter and PromptRouter for deterministic ordering (#665)

ToolRouter::list_all() and PromptRouter::list_all() iterate over a
HashMap, which returns items in non-deterministic order. Since list_all()
backs the tools/list and prompts/list MCP protocol responses, this causes
MCP clients to receive differently-ordered results across calls and
process restarts, leading to intermittent tool discovery failures.

Sort the output alphabetically by name to guarantee stable ordering.

crates/rmcp/src/handler/server/router/prompt.rs

@@ -187,7 +187,9 @@ where
     }
 
     pub fn list_all(&self) -> Vec<crate::model::Prompt> {
-        self.map.values().map(|item| item.attr.clone()).collect()
+        let mut prompts: Vec<_> = self.map.values().map(|item| item.attr.clone()).collect();
+        prompts.sort_by(|a, b| a.name.cmp(&b.name));
+        prompts
     }
 }
 

crates/rmcp/src/handler/server/router/tool.rs

@@ -252,7 +252,9 @@ where
     }
 
     pub fn list_all(&self) -> Vec<crate::model::Tool> {
-        self.map.values().map(|item| item.attr.clone()).collect()
+        let mut tools: Vec<_> = self.map.values().map(|item| item.attr.clone()).collect();
+        tools.sort_by(|a, b| a.name.cmp(&b.name));
+        tools
     }
 
     /// Get a tool definition by name.