🤖 docs: Add Truefoundry Custom Endpoint Example (#374)

* added truefoundry mdx

* docs: update TrueFoundry configuration with model naming and structured features

* docs: simplify TrueFoundry documentation by removing Key Features section

* updated tfy docs for librechat

* added truefoundry ai gateway in docs

pages/docs/configuration/librechat_yaml/ai_endpoints/truefoundry.mdx

@@ -0,0 +1,31 @@
+---
+title: TrueFoundry AI Gateway
+---
+
+TrueFoundry AI Gateway is the proxy layer that sits between your applications and the LLM providers and MCP Servers. It is an enterprise-grade platform that enables users to access 1000+ LLMs using a unified interface while taking care of observability and governance.
+
+## Configuration Details
+
+To use [TrueFoundry's AI Gateway](https://www.truefoundry.com/ai-gateway) follow the quick start guide [here](https://docs.truefoundry.com/gateway/quick-start).
+
+### Getting Base URL and Model Names
+
+- **Base URL and Model Names**: Get your TrueFoundry AI Gateway endpoint URL and model name from the unified code snippet (ensure you have added the same model name)
+- **PAT**: Generate from your TrueFoundry Personal Access Token [PAT](https://docs.truefoundry.com/gateway/authentication#personal-access-token-pat)
+
+## Using TrueFoundry AI Gateway with any LLM model
+```yaml filename="librechat.yaml"
+      - name: "TrueFoundry"
+        apiKey: "${TRUEFOUNDRY_API_KEY}"
+        baseURL: "${TRUEFOUNDRY_GATEWAY_URL}"
+        models:
+            default: ["openai-main/gpt-4o-mini", "openai-main/gpt-4o"]
+            fetch: true
+        titleConvo: true
+        titleModel: "current_model"
+        summarize: false
+        summaryModel: "current_model"
+        forcePrompt: false
+        modelDisplayLabel: "TrueFoundry:OpenAI"
+```
+For more details you can check: [TrueFoundry Docs](https://docs.truefoundry.com/docs/introduction)