Support fp: targets and downgrade CTI error log

Treat target IDs starting with "fp:" as valid and return settings early so open() can match devices by fingerprint via existing _select_device/_match_device logic. Also change CTI file load failures from logger.exception to logger.warning to reduce noisy stack traces while still recording failed files for diagnostics.

Author: C-Achard

dlclivegui/cameras/backends/gentl_backend.py

@@ -337,6 +337,9 @@ def rebind_settings(cls, settings):
             cls._persist_serial_identity(settings, target_id_str)
             return settings
 
+        if target_id_str.startswith("fp:"):
+            return settings  # open() will match by fingerprint via _select_device → _match_device
+
         # Non-serial fallback retained for older configs / fingerprint IDs.
         harvester = None
         try:

dlclivegui/cameras/backends/utils/gentl_discovery.py

@@ -51,7 +51,7 @@ def __init__(self, cti_files: list[str]):
                 self.harvester.add_file(cti)
                 self.loaded_files.append(cti)
             except Exception as e:
-                logger.exception(f"Failed to load CTI file: {cti}. Skipping.")
+                logger.warning(f"Failed to load CTI file: {cti}. Skipping.")
                 self.failed_files[cti] = str(e)
 
         if not self.loaded_files: