Add ArcadeDB — built-in MCP server for multi-model database

ArcadeDB (https://github.com/ArcadeData/arcadedb) ships with a built-in
MCP server since v26.3.1. No external process or separate package needed.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -491,6 +491,7 @@ Secure database access with schema inspection capabilities. Enables querying and
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