Normalize native dependency ownership and split config UI

Make distro packages the single source of truth for GTK/X11 Python bindings instead of advertising them as wheel-managed runtime dependencies. Update the uv, CI, and packaging workflows to use system site packages, regenerate uv.lock, and keep portable and Arch metadata aligned with that contract.

Pull runtime policy, audio probing, and page builders out of config_ui.py so the settings window becomes a coordinator instead of a single large mixed-concern module. Rename the config serialization and logging helpers, and stop startup logging from exposing raw vocabulary entries or custom model paths.

Remove stale helper aliases and add regression coverage for safe startup logging, packaging metadata and module drift, portable requirements, and the extracted audio helper behavior.

Validated with uv lock, python3 -m compileall -q src tests, python3 -m unittest discover -s tests -p 'test_*.py', make build, and make package-arch.

docs/developer-workflows.md

@@ -36,10 +36,15 @@ For `1.0.0`, the manual publication target is the forge release page at
 `uv` workflow:
 
 ```bash
-uv sync
+python3 -m venv --system-site-packages .venv
+. .venv/bin/activate
+uv sync --active
 uv run aman run --config ~/.config/aman/config.json
 ```
 
+Install the documented distro runtime dependencies first so the active virtualenv
+can see GTK/AppIndicator/X11 bindings from the system Python.
+
 `pip` workflow:
 
 ```bash