feat: add support for JSON Schema conditional validation (allOf/if/then)

[yogesh-badke]

Implement comprehensive support for JSON Schema Draft-07 conditional validation
keywords to properly document schemas with mode-based configurations.

Changes:

• Add parsing for allOf, anyOf, oneOf, if, then, else, and const keywords
• Implement Option 1: Display conditional requirements inline (e.g., "When mode=cluster")
• Implement Option 4: Generate mode-specific configuration sections with hyperlinks
• Add recursive nested property rendering in mode-specific sections
• Track conditional requirements and map properties to controlling mode values
• Resolve conditional schemas through reference resolution

The implementation provides dual UX approaches:

1. Inline conditions in the Required column for quick reference
2. Dedicated mode-specific sections with deep-linked enum values for detailed exploration

Fixes conditional validation documentation where properties required under specific
conditions were incorrectly shown as optional. Now correctly shows:

• "When mode=cluster" for cluster-specific properties
• "When mode=sentinel" for sentinel-specific properties
• Hyperlinked mode-specific sections (e.g., config-cluster, config-sentinel)
• Fully recursive nested property documentation at any depth

All existing tests pass with no regression.