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/Result.py

@@ -33,7 +33,7 @@ class Result:
     def __try_decode(
         self,
         stdxxx: bytes | None,
-        quote = False,
+        quote: bool = False,
         truncate: int | None = None,
         annotate: bool = True,
         label: str | None = None,
@@ -59,7 +59,7 @@ class Result:
         self,
         cmd: list[str] | None = None,
         wd: str | None = None,
-        verbose = True
+        verbose: bool = True,
     ) -> str:
 
         def __status_str(cmd: list[str] | None, wd: str | None, verbose: bool) -> str: