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/validate-node-minimal.ts

@@ -0,0 +1,47 @@
+import { ToolDocumentation } from '../types';
+
+export const validateNodeMinimalDoc: ToolDocumentation = {
+  name: 'validate_node_minimal',
+  category: 'validation',
+  essentials: {
+    description: 'Fast check for missing required fields only. No warnings/suggestions. Returns: list of missing fields.',
+    keyParameters: ['nodeType', 'config'],
+    example: 'validate_node_minimal("nodes-base.slack", {resource: "message"})',
+    performance: 'Instant',
+    tips: [
+      'Returns only missing required fields',
+      'No warnings or suggestions',
+      'Perfect for real-time validation'
+    ]
+  },
+  full: {
+    description: 'Minimal validation that only checks for missing required fields. Returns array of missing field names without any warnings or suggestions. Ideal for quick validation during node configuration.',
+    parameters: {
+      nodeType: { type: 'string', required: true, description: 'Node type with prefix (e.g., "nodes-base.slack")' },
+      config: { type: 'object', required: true, description: 'Node configuration to validate' }
+    },
+    returns: 'Array of missing required field names (empty if valid)',
+    examples: [
+      'validate_node_minimal("nodes-base.slack", {resource: "message", operation: "post"}) - Check Slack config',
+      'validate_node_minimal("nodes-base.httpRequest", {method: "GET"}) - Check HTTP config'
+    ],
+    useCases: [
+      'Real-time form validation',
+      'Quick configuration checks',
+      'Pre-deployment validation',
+      'Interactive configuration builders'
+    ],
+    performance: 'Instant - Simple field checking without complex validation',
+    bestPractices: [
+      'Use for quick feedback loops',
+      'Follow with validate_node_operation for thorough check',
+      'Check return array length for validity'
+    ],
+    pitfalls: [
+      'Only checks required fields',
+      'No type validation',
+      'No operation-specific validation'
+    ],
+    relatedTools: ['validate_node_operation', 'get_node_essentials', 'get_property_dependencies']
+  }
+};