refactor(dotfiles): rename system/ to common/ and remove unused configs

Rename dotfiles/system to dotfiles/common for clarity - indicates
shared dotfiles used across all desktop environments (DWM, Hyprland).

Removed config directories for uninstalled applications:
- ghostty (using different terminal)
- lf (using ranger instead)
- mopidy (using mpd instead)
- nitrogen (X11-only, obsolete for Wayland)
- pychess (not installed)
- JetBrains (not installed via archsetup)
- youtube-dl (using yt-dlp with different config location)

Kept audacious config for potential future use.

Updated all references in archsetup, CLAUDE.md, todo.org, and
validation.sh.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 62 insertions, 0 deletions

diff --git a/dotfiles/common/.config/ranger/commands.py b/dotfiles/common/.config/ranger/commands.py
new file mode 100644
index 0000000..97b7909
--- /dev/null
+++ b/dotfiles/common/.config/ranger/commands.py
@@ -0,0 +1,62 @@
+# This is a sample commands.py.  You can add your own commands here.
+#
+# Please refer to commands_full.py for all the default commands and a complete
+# documentation.  Do NOT add them all here, or you may end up with defunct
+# commands when upgrading ranger.
+
+# A simple command for demonstration purposes follows.
+# -----------------------------------------------------------------------------
+
+from __future__ import (absolute_import, division, print_function)
+
+# You can import any python module as needed.
+import os
+
+# You always need to import ranger.api.commands here to get the Command class:
+from ranger.api.commands import Command
+
+
+# Any class that is a subclass of "Command" will be integrated into ranger as a
+# command.  Try typing ":my_edit<ENTER>" in ranger!
+class my_edit(Command):
+    # The so-called doc-string of the class will be visible in the built-in
+    # help that is accessible by typing "?c" inside ranger.
+    """:my_edit <filename>
+
+    A sample command for demonstration purposes that opens a file in an editor.
+    """
+
+    # The execute method is called when you run this command in ranger.
+    def execute(self):
+        # self.arg(1) is the first (space-separated) argument to the function.
+        # This way you can write ":my_edit somefilename<ENTER>".
+        if self.arg(1):
+            # self.rest(1) contains self.arg(1) and everything that follows
+            target_filename = self.rest(1)
+        else:
+            # self.fm is a ranger.core.filemanager.FileManager object and gives
+            # you access to internals of ranger.
+            # self.fm.thisfile is a ranger.container.file.File object and is a
+            # reference to the currently selected file.
+            target_filename = self.fm.thisfile.path
+
+        # This is a generic function to print text in ranger.
+        self.fm.notify("Let's edit the file " + target_filename + "!")
+
+        # Using bad=True in fm.notify allows you to print error messages:
+        if not os.path.exists(target_filename):
+            self.fm.notify("The given file does not exist!", bad=True)
+            return
+
+        # This executes a function from ranger.core.acitons, a module with a
+        # variety of subroutines that can help you construct commands.
+        # Check out the source, or run "pydoc ranger.core.actions" for a list.
+        self.fm.edit_file(target_filename)
+
+    # The tab method is called when you press tab, and should return a list of
+    # suggestions that the user will tab through.
+    # tabnum is 1 for <TAB> and -1 for <S-TAB> by default
+    def tab(self, tabnum):
+        # This is a generic tab-completion function that iterates through the
+        # content of the current directory.
+        return self._tab_directory_content()