feat: add n8n workflow templates as MCP tools

- Add 4 new MCP tools for workflow templates
- Integrate with n8n.io API to fetch community templates
- Filter templates to last 6 months only
- Store templates in SQLite with full workflow JSON
- Manual fetch system (not part of regular rebuild)
- Support search by nodes, keywords, and task categories
- Add fetch:templates and test:templates npm scripts
- Update to v2.4.1

🤖 Generated with Claude Code

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

src/templates/README.md

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+# n8n Templates Integration
+
+This module provides integration with n8n.io's workflow templates, allowing AI agents to discover and use proven workflow patterns.
+
+## Features
+
+- **API Integration**: Connects to n8n.io's official template API
+- **Fresh Templates**: Only includes templates updated within the last 6 months
+- **Manual Fetch**: Templates are fetched separately from the main node database
+- **Full Workflow JSON**: Complete workflow definitions ready for import
+- **Smart Search**: Find templates by nodes, keywords, or task categories
+
+## Usage
+
+### Fetching Templates
+
+```bash
+npm run fetch:templates
+```
+
+This command will:
+1. Connect to n8n.io API
+2. Fetch all templates from the last 6 months
+3. Download complete workflow JSON for each template
+4. Store in local SQLite database
+5. Display progress and statistics
+
+### Testing
+
+```bash
+npm run test:templates
+```
+
+### MCP Tools
+
+The following tools are available via MCP:
+
+- `list_node_templates(nodeTypes, limit)` - Find templates using specific nodes
+- `get_template(templateId)` - Get complete workflow JSON
+- `search_templates(query, limit)` - Search by keywords
+- `get_templates_for_task(task)` - Get templates for common tasks
+
+### Task Categories
+
+- `ai_automation` - AI-powered workflows
+- `data_sync` - Database and spreadsheet synchronization
+- `webhook_processing` - Webhook handling workflows
+- `email_automation` - Email processing workflows
+- `slack_integration` - Slack bots and notifications
+- `data_transformation` - Data manipulation workflows
+- `file_processing` - File handling workflows
+- `scheduling` - Scheduled and recurring tasks
+- `api_integration` - External API connections
+- `database_operations` - Database CRUD operations
+
+## Implementation Details
+
+### Architecture
+
+- `template-fetcher.ts` - Handles API communication and rate limiting
+- `template-repository.ts` - Database operations and queries
+- `template-service.ts` - Business logic and MCP integration
+
+### Database Schema
+
+Templates are stored in a dedicated table with:
+- Workflow metadata (name, description, author)
+- Node usage tracking
+- View counts for popularity
+- Complete workflow JSON
+- Creation/update timestamps
+- 6-month freshness constraint
+
+### API Endpoints Used
+
+- `/api/templates/workflows` - List all workflows
+- `/api/templates/search` - Search with pagination
+- `/api/templates/workflows/{id}` - Get specific workflow
+- `/api/templates/search/filters` - Available filters
+
+## Notes
+
+- Templates are NOT fetched during regular database rebuilds
+- Run `fetch:templates` manually when you need fresh templates
+- API rate limiting is implemented (200-500ms between requests)
+- Progress is shown during fetching for large datasets