Implement SQLite database with full-text search for n8n node documentation

Major features implemented:
- SQLite storage service with FTS5 for fast node search
- Database rebuild mechanism for bulk node extraction
- MCP tools: search_nodes, extract_all_nodes, get_node_statistics
- Production Docker deployment with persistent storage
- Management scripts for database operations
- Comprehensive test suite for all functionality

Database capabilities:
- Stores node source code and metadata
- Full-text search by node name or content
- No versioning (stores latest only as per requirements)
- Supports complete database rebuilds
- ~4.5MB database with 500+ nodes indexed

Production features:
- Automated deployment script
- Docker Compose production configuration
- Database initialization on first run
- Volume persistence for data
- Management utilities for operations

Documentation:
- Updated README with complete instructions
- Production deployment guide
- Clear troubleshooting section
- API reference for all new tools

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

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

src/mcp/tools.ts

@@ -181,4 +181,55 @@ export const n8nTools: ToolDefinition[] = [
       },
     },
   },
+  {
+    name: 'extract_all_nodes',
+    description: 'Extract and store all available n8n nodes in the database',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        packageFilter: {
+          type: 'string',
+          description: 'Optional package name to filter extraction',
+        },
+        limit: {
+          type: 'number',
+          description: 'Maximum number of nodes to extract',
+        },
+      },
+    },
+  },
+  {
+    name: 'search_nodes',
+    description: 'Search for n8n nodes by name, package, or functionality',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        query: {
+          type: 'string',
+          description: 'Search query',
+        },
+        packageName: {
+          type: 'string',
+          description: 'Filter by package name',
+        },
+        hasCredentials: {
+          type: 'boolean',
+          description: 'Filter nodes that have credentials',
+        },
+        limit: {
+          type: 'number',
+          description: 'Maximum results to return',
+          default: 20,
+        },
+      },
+    },
+  },
+  {
+    name: 'get_node_statistics',
+    description: 'Get statistics about stored n8n nodes',
+    inputSchema: {
+      type: 'object',
+      properties: {},
+    },
+  },
 ];