tc-wfx-plugin v0.7.0-beta

TC WFX plugin beta release v0.7.0-beta.\n\nContract change:\n- Aligns the plugin root discovery with the bridge connection contract.\n- Uses /bridge/wfx/connections and maps connection_names/default_connection into the existing WFX root-list layer.\n\nCompatibility:\n- v0.5.0-beta remains available as the stable downloadable five-series release.\n- This release targets dms-provider-bridge v0.7.1-beta.\n\nValidation:\n- dotnet test: 137 passed\n- publish-wfx: completed successfully