chore: update n8n to 2.2.3 and bump version to 2.31.7 (#523)

- Updated n8n from 2.1.5 to 2.2.3
- Updated n8n-core from 2.1.4 to 2.2.2
- Updated n8n-workflow from 2.1.1 to 2.2.2
- Updated @n8n/n8n-nodes-langchain from 2.1.4 to 2.2.2
- Rebuilt node database with 540 nodes (434 from n8n-nodes-base, 106 from @n8n/n8n-nodes-langchain)
- Updated README badge with new n8n version
- Updated CHANGELOG with dependency changes

Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Romuald Członkowski <romualdczlonkowski@MacBook-Pro-Romuald.local>
Co-authored-by: Claude <noreply@anthropic.com>

dist/types/index.d.ts

@@ -7,6 +7,13 @@ export interface MCPServerConfig {
     host: string;
     authToken?: string;
 }
+export interface ToolAnnotations {
+    title?: string;
+    readOnlyHint?: boolean;
+    destructiveHint?: boolean;
+    idempotentHint?: boolean;
+    openWorldHint?: boolean;
+}
 export interface ToolDefinition {
     name: string;
     description: string;
@@ -22,6 +29,7 @@ export interface ToolDefinition {
         required?: string[];
         additionalProperties?: boolean | Record<string, any>;
     };
+    annotations?: ToolAnnotations;
 }
 export interface ResourceDefinition {
     uri: string;