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/cmds/projects/CmdCheck.py

@@ -4,7 +4,7 @@ from .Cmd import Cmd, Parent
 from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
-    from argparse import ArgumentParser
+    from argparse import ArgumentParser, Namespace
 
 class CmdCheck(Cmd):  # export
 
@@ -17,7 +17,7 @@ class CmdCheck(Cmd):  # export
         self.load_subcommands()
 
     @override
-    async def _run(self, args):
+    async def _run(self, args: Namespace) -> None:
         import sys
 
         # Missing subcommand