refactor: remove automatic log_summary() call from get_parser_registry()

The summary was logged once per process, causing it to appear repeatedly
during Docker startup (management commands, web server, each Celery
worker subprocess). External parsers are already announced individually
at INFO when discovered; the full summary is redundant noise.
log_summary() is retained on ParserRegistry for manual/debug use.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/paperless/parsers/registry.py

@@ -74,7 +74,6 @@ def get_parser_registry() -> ParserRegistry:
     1. Creates a new ParserRegistry.
     2. Calls register_defaults to install built-in parsers.
     3. Calls discover to load third-party plugins via importlib.metadata entrypoints.
-    4. Calls log_summary to emit a startup summary.
 
     Subsequent calls return the same instance immediately.
 
@@ -91,7 +90,6 @@ def get_parser_registry() -> ParserRegistry:
 
     if not _discovery_complete:
         _registry.discover()
-        _registry.log_summary()
         _discovery_complete = True
 
     return _registry