Chore: Improve idle memory via more lazy imports (#14599)

* Chore: Import dateparser lazily so processes that never parse dates skip it

* Chore: Import turbohtml lazily in the mail parser

* Chore: Import lxml lazily in the SVG validator

* Chore: Import paperless_ai.indexing lazily in document tasks

* Chore: Import paperless_ai helpers lazily in views

* Chore: Read the OCRmyPDF sRGB profile on first use instead of at import

* Chore: Import pikepdf and img2pdf lazily so startup does not load them

* Chore: Reuse the initialized Django ASGI application for HTTP routing

src/documents/plugins/date_parsing/base.py

@@ -7,8 +7,6 @@ from dataclasses import dataclass
 from types import TracebackType
 from typing import Self
 
-import dateparser
-
 logger = logging.getLogger(__name__)
 
 
@@ -80,6 +78,8 @@ class DateParserPluginBase(ABC):
 
         Uses configuration from `self.config`.
         """
+        import dateparser
+
         try:
             return dateparser.parse(
                 date_string,