App, cmds, lib: Fix Any returns from typed functions

Add type annotations and casts to functions that were returning Any
where a specific type was declared, satisfying the new warn_return_any
mypy rule.

Fixes:
- log.py: get_caller_pos return type via cast
- AsyncRunner.py: cast T for fut.result()
- util.py: cast for getattr result, str() for args.username
- FileContext.py: verbose_default bool annotation
- SSHClient.py: cast SSHClient for dynamic import
- lib/App.py: cast ArgumentParser, add return types to inner funcs
- pm/rpm.py, dpkg.py: cast Iterable[Package]
- App.py: cast for self.args.func(), add return types to inner funcs
- BaseCmdPkgRelations.py: cast str for args.delimiter

Assisted-by: unsloth/Qwen3.6-35B-A3B-GGUF:IQ4_NL and pi.dev 0.81.1
Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/lib/Distro.py

@@ -6,7 +6,7 @@ import re
 import sys
 
 from functools import cached_property
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Any
 
 from .log import ERR, INFO, WARNING, log
 from .base import InputMode
@@ -108,8 +108,8 @@ class Distro(abc.ABC):
         ec: ExecContext,
         id: str | None = None,
         os_release_str: str | None = None,
-        **kwargs,
-    ):
+        **kwargs: Any,
+    ) -> 'Distro':
         if id is None:
             os_release_str = await cls.read_os_release_str(ec)
             id = cls.parse_os_release_field_id(os_release_str)
@@ -142,8 +142,9 @@ class Distro(abc.ABC):
 
     @cached_property
     def os_cascade(self) -> list[str]:
+        ret: list[str] = []
 
-        def __append(entry: str):
+        def __append(entry: str) -> None:
             if entry not in ret:
                 ret.append(entry)
 
@@ -322,10 +323,10 @@ class Distro(abc.ABC):
     def default_pkg_filter(self) -> PackageFilter | None:
         return self.__default_pkg_filter
 
-    async def run(self, *args, **kwargs) -> Result:
+    async def run(self, *args: Any, **kwargs: Any) -> Result:
         return await self.__exec_context.run(*args, **kwargs)
 
-    async def sudo(self, *args, **kwargs) -> Result:
+    async def sudo(self, *args: Any, **kwargs: Any) -> Result:
         return await self.__exec_context.sudo(*args, **kwargs)
 
     @property