fix(convert): preserve capability config forms

[Quick104]

Problem

Capability config schemas lose their admin form when they pass through CapabilityRecordsFromManifest and DecodeCapability. Silo persists that record during plugin installation, so a watch-provider capability installed with a valid connection form is later discovered with only the scalar JSON schema and no renderable fields.

Part of Silo-Server/silo-server#549. Required by Silo-Server/silo-server#550.

Fix

• serialize each complete ConfigSchema proto into capability metadata instead of copying a scalar allowlist
• decode the complete stored schema back through protojson
• retain forward compatibility by discarding unknown future fields during decode
• assert full proto equality, including AdminFormDescriptor, across the record round trip

This is an implementation fix only; it adds no protobuf fields and remains wire-compatible with v0.13.0 plugins and existing scalar-only capability records.

Live evidence

In an isolated dev-builder sandbox, the uploaded Floppy v0.2 manifest response contained config_schema.admin_form, but GET /api/v1/watch-providers returned the same schema without admin_form after capability persistence and reload. Inspection traced the loss to the converter scalar allowlist changed here.

Validation

Passed on commit 6bd04a8:

• go test -race ./...
• go vet ./...
• focused race tests for convert, manifest, and runtime
• git diff --check

AI assistance disclosure

• Tool: Codex
• Model: gpt-5.6
• Involvement: AI-assisted live diagnosis, implementation, compatibility review, and validation on behalf of repository maintainer Quick104.

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📥 Commits

Reviewing files that changed from the base of the PR and between 13d7ccc and 5894c99.

📒 Files selected for processing (2)

• pkg/pluginsdk/convert/convert.go
• pkg/pluginsdk/convert/convert_test.go

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