fix: include poci servers in catalog-next legacy catalog import

[jchangx]

Summary

• Bug: When the MCPWorkingSets feature flag is enabled, Docker Desktop uses the catalog-next API path which calls createCatalogFromLegacyCatalog to convert the legacy Docker MCP catalog. This function only handled server (with image) and remote types, silently dropping poci servers like curl, ffmpeg, and docker.
• Fix: Added poci as a first-class ServerType throughout the catalog-next pipeline: workingset types, catalog-next server struct, DB schema migration, and the legacy catalog import function.
• Result: Poci servers now appear in the Docker Desktop MCP catalog regardless of whether MCPWorkingSets is enabled.

Changes

pkg/catalog_next/create.go

Added else if server.Type == "poci" branch in createCatalogFromLegacyCatalog:

} else if server.Type == "poci" {
    s := Server{
        Type: workingset.ServerTypePoci,
        Snapshot: &workingset.ServerSnapshot{
            Server: server,
        },
    }
    s.Snapshot.Server.Name = name
    servers = append(servers, s)
}

pkg/workingset/workingset.go

• Added ServerTypePoci ServerType = "poci" constant
• Updated Server.Type validation to include poci
• Added poci handling in ResolveFile for servers without a top-level image

pkg/catalog_next/catalog.go

• Updated Server.Type validation to accept poci

pkg/db/migrations/007_add_poci_support.up.sql

• Added poci to the catalog_server.server_type CHECK constraint

Test plan

• New test TestCreateFromLegacyCatalogWithPociServers verifies poci servers survive the legacy→catalog-next round trip
• All existing catalog_next, workingset, db, and policy tests pass
• Manual: enable MCPWorkingSets flag, verify curl/ffmpeg/docker appear in Docker Desktop catalog

How to verify locally

# Run the new test
go test ./pkg/catalog_next/... -run TestCreateFromLegacyCatalogWithPociServers -v

# Run all related tests
go test ./pkg/catalog_next/... ./pkg/workingset/... ./pkg/db/... ./pkg/policy/...

# Build and test with Docker Desktop
make build
# Replace the mcp-gateway binary and restart Docker Desktop
# Enable MCPWorkingSets feature flag
# Verify curl, ffmpeg, docker servers appear in the MCP catalog

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