feat(mcp): add tool presets and audit commands

- Introduce reference MCP presets with installation/audit helpers and remove legacy connector lists.
- Add CLI `owlen tools` commands to install presets or audit configuration, with optional pruning.
- Extend the TUI :tools command to support listing presets, installing them, and auditing current configuration.
- Document the preset workflow and provide regression tests for preset application.

crates/owlen-core/tests/file_server.rs

@@ -32,7 +32,7 @@ async fn remote_file_server_read_and_list() {
 
     // Read file via MCP
     let call = McpToolCall {
-        name: "resources/get".to_string(),
+        name: "resources_get".to_string(),
         arguments: serde_json::json!({"path": "hello.txt"}),
     };
     let resp = client.call_tool(call).await.expect("call_tool");
@@ -41,7 +41,7 @@ async fn remote_file_server_read_and_list() {
 
     // List directory via MCP
     let list_call = McpToolCall {
-        name: "resources/list".to_string(),
+        name: "resources_list".to_string(),
         arguments: serde_json::json!({"path": "."}),
     };
     let list_resp = client.call_tool(list_call).await.expect("list_tool");