Add AISIX AI Gateway integration page

[moonming]

Adds an integration page for AISIX to the gateways catalog, plus the meta.json registration.

What is AISIX: AISIX is an open-source (Apache-2.0) AI gateway for LLMs and AI agents, written in Rust, made by API7.ai.

Why this entry: AISIX ships a built-in OTLP/HTTP exporter that emits OpenTelemetry GenAI (gen_ai.*) spans, so traffic routed through the gateway can be traced in Langfuse with a few lines of gateway config and no application or SDK changes. The page documents that path end to end (credentials, gateway config, request, traces) and follows the structure of the existing gateway entries.

Notes for reviewers:

• Every field in the resources.yaml example exists in AISIX's published exporter JSON schema (schemas/resources/observability_exporter.schema.json in the AISIX repo); the surrounding file shape matches the AISIX quickstart docs.
• Langfuse-side details (/api/public/otel/v1/traces, Basic Auth from project keys, x-langfuse-ingestion-version: 4, data regions) match this repo's azure-api-management.mdx.
• Checked locally against the repo's Prettier config and the check-h1-headings.js logic; internal links used (/resources/engineering/llm-gateway, /self-hosting, /integrations/native/opentelemetry) are routes already linked from existing gateway pages.
• No logo asset is included yet — happy to add an icon under /images/integrations/ in whatever format you prefer for the card.
• Disclosure: I work on AISIX.

Greptile Summary

Adds AISIX to the AI gateways integration catalog.

• Documents configuring AISIX’s OTLP/HTTP exporter with Langfuse credentials and regional endpoints.
• Provides gateway startup, request, tracing, content-capture, and sampling guidance.
• Registers the integration in gateway navigation and adds its SVG logo.

Confidence Score: 5/5

The PR appears safe to merge with no concrete blocking or non-blocking defects identified.

The new page follows the existing integrations content structure, is registered in the gateway metadata, references an included logo, and uses the established Langfuse OTLP endpoint and authentication configuration.

_{Reviews (1): Last reviewed commit: "Add AISIX AI Gateway integration page" | Re-trigger Greptile}

Context used:

• Knowledge Base — Content and MDX Build Pipeline
• Knowledge Base — Cookbook and Integrations Pipeline

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