Replace empty get_config/set_config stubs with working implementations
using Uniview's native LAPI JSON REST API. Modernize open() to use base
class guess_credentials() and get_realm() instead of duplicated auth
logic. Rename put() to PutCmd() to fix broken PTZ methods. Remove
package-level globals in favor of instance variables. Add lapi_get/
lapi_put helpers, probe via LAPI with ISAPI fallback, and rtsp_url().
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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