chore: update n8n to v1.100.1

- Updated n8n from 1.99.1 to 1.100.1
- Updated n8n-core from 1.98.0 to 1.99.0
- Updated n8n-workflow from 1.96.0 to 1.97.0
- Updated @n8n/n8n-nodes-langchain from 1.98.1 to 1.99.0
- Fixed node loader path for n8n-nodes-base
- Rebuilt node database with 526 nodes
- All validation tests passing

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

Co-Authored-By: Claude <noreply@anthropic.com>

src/loaders/node-loader.ts

@@ -8,7 +8,7 @@ export interface LoadedNode {
 
 export class N8nNodeLoader {
   private readonly CORE_PACKAGES = [
-    { name: 'n8n-nodes-base', path: 'n8n/node_modules/n8n-nodes-base' },
+    { name: 'n8n-nodes-base', path: 'n8n-nodes-base' },
     { name: '@n8n/n8n-nodes-langchain', path: '@n8n/n8n-nodes-langchain' }
   ];