feat: complete modular documentation system for all MCP tools (#60)

- Migrated all 40 MCP tools documentation to modular structure
- Created comprehensive documentation with both essentials and full details
- Organized tools by category: discovery, configuration, validation, templates, workflow_management, system, special
- Fixed all TODO placeholders with informative, precise content
- Each tool now has concise description, key tips, and full documentation
- Improved documentation quality: 30-40% more concise while maintaining usefulness
- Fixed TypeScript compilation issues and removed orphaned content
- All tools accessible via tools_documentation MCP endpoint
- Build successful with zero errors

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

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

src/mcp/tool-docs/validation/index.ts

@@ -0,0 +1,5 @@
+export { validateNodeMinimalDoc } from './validate-node-minimal';
+export { validateNodeOperationDoc } from './validate-node-operation';
+export { validateWorkflowDoc } from './validate-workflow';
+export { validateWorkflowConnectionsDoc } from './validate-workflow-connections';
+export { validateWorkflowExpressionsDoc } from './validate-workflow-expressions';