RFC: Node configuration redesign — unify services.json sections, freeze getServiceSchemas

[stepmikhaylov]

Branch refactor/node-config — implementation of this redesign.

Docs docs/README-node-schema.md — reference for the final schema format.

New Schema services.new.json

Status

• The new format has been worked out, reviewed, and agreed with Rod, and is now documented.
• Nodes already converted to the new format: chat, dropper, webhook, filesys, parse, qdrant, the response family (9 nodes), and the google tool family (5 nodes) — 20 services across 8 node directories, plus the shared core property libraries.
• The final schema drops RJSF entirely. services.cpp now fully expands every property — references, use overrides, grouped subsections, arrays, enum branches — into the resolved schema, using a small, flat set of notations (plain fields, constant, oauth2, upload, and hidden/secret/readonly/required flags) instead of the old RJSF-oriented vocabulary.
• Attached: services.new.json, the current final schema for all converted nodes.
• The schema is stable and ready for UI development to start against.

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[asclearuc]

@stepmikhaylov - LGTM !