Decouple non-UI CLI startup from config_ui

Stop aman.py from importing the GTK settings module at module load so version, init, bench, diagnostics, and top-level help can start without pulling in the UI stack.\n\nPromote PyGObject and python-xlib into main project dependencies, switch the documented source install surface to plain uv/pip commands, and teach the portable, deb, and Arch packaging flows to install filtered runtime requirements before the Aman wheel so they still rely on distro-provided GTK/X11 packages.\n\nAdd regression coverage for importing aman with config_ui blocked and for the portable bundle's new requirements payload, then rerun the focused CLI/diagnostics/portable tests plus py_compile.

uv.lock

@@ -16,13 +16,9 @@ dependencies = [
     { name = "numpy", version = "2.2.6", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.11'" },
     { name = "numpy", version = "2.4.2", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.11'" },
     { name = "pillow" },
-    { name = "sounddevice" },
-]
-
-[package.optional-dependencies]
-x11 = [
     { name = "pygobject" },
     { name = "python-xlib" },
+    { name = "sounddevice" },
 ]
 
 [package.metadata]
@@ -31,11 +27,11 @@ requires-dist = [
     { name = "llama-cpp-python" },
     { name = "numpy" },
     { name = "pillow" },
-    { name = "pygobject", marker = "extra == 'x11'" },
-    { name = "python-xlib", marker = "extra == 'x11'" },
+    { name = "pygobject" },
+    { name = "python-xlib" },
     { name = "sounddevice" },
 ]
-provides-extras = ["x11", "wayland"]
+provides-extras = ["wayland"]
 
 [[package]]
 name = "anyio"