Fix Knowledge Base Tool Argument Routing (x-pass-as-object)

Goal

Fix a routing bug in the neo.mjs-knowledge-base MCP server that prevented the manage_knowledge_base and manage_database tools from receiving their arguments correctly when called via the internal Node.js SDK (ai/services.mjs).

Context

During an attempt to trigger a knowledge base sync, the manage_knowledge_base tool threw an error: Invalid action: undefined. Investigation revealed that ai/services.mjs uses OpenApiValidator.mjs and the openapi.yaml spec to dynamically generate Zod schemas and validate/route arguments to the underlying service methods.

If an OpenAPI endpoint lacks the x-pass-as-object: true annotation, the SDK attempts to map the JSON request body properties to positional arguments based on a heuristic, which fails for complex service methods that expect a single destructured config object (e.g., manageKnowledgeBase({action})).

The query_documents tool had this annotation, but the newer manage_database and manage_knowledge_base tools introduced in Epic #8315 were missing it.

Acceptance Criteria

• Add x-pass-as-object: true to the /db/manage (manage_database) path in ai/mcp/server/knowledge-base/openapi.yaml.
• Add x-pass-as-object: true to the /db/data/manage (manage_knowledge_base) path in the same file.
• Verify that calling these tools via the SDK correctly passes the arguments as an object.