Add Foundgine to .NET server tools

[CristianBarragan]

Description

Add Foundgine to .NET server tools

This PR adds Foundgine to the GraphQL.org .NET server/tooling listings.

Foundgine is a semantic execution layer for .NET that composes application entities, relationships, and capabilities into authorized, executable operations.

The example demonstrates a product composed from four entities:

Product
 ├── Catalog
 ├── Inventory
 ├── Pricing
 └── Reviews

It also highlights Foundgine's dynamic capability model, where callers can compose operations from available semantic capabilities rather than requiring a separate hard-coded endpoint for every combination.

Why this belongs in the GraphQL ecosystem

Foundgine is complementary to GraphQL rather than a replacement for it. GraphQL can provide the client-facing API while Foundgine provides the semantic execution layer behind the API.

The same application capabilities can also be consumed by APIs, automation, and AI agents.

Key capabilities demonstrated

• Composable entities and relationships
• Dynamic capability composition
• Structured application intent
• Authorization-aware execution
• Provider-independent execution planning
• Integration with GraphQL and other callers

The page follows the existing GraphQL.org tooling page format and keeps the description intentionally concise.

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