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, 213 insertions, 0 deletions

diff --git a/dotfiles/common/.zsh/modules/Src/string.c b/dotfiles/common/.zsh/modules/Src/string.c
new file mode 100644
index 0000000..9e14ef9
--- /dev/null
+++ b/dotfiles/common/.zsh/modules/Src/string.c
@@ -0,0 +1,213 @@
+/*
+ * string.c - string manipulation
+ *
+ * This file is part of zsh, the Z shell.
+ *
+ * Copyright (c) 2000 Peter Stephenson
+ * All rights reserved.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and to distribute modified versions of this software for any
+ * purpose, provided that the above copyright notice and the following
+ * two paragraphs appear in all copies of this software.
+ *
+ * In no event shall Peter Stephenson or the Zsh Development Group be liable
+ * to any party for direct, indirect, special, incidental, or consequential
+ * damages arising out of the use of this software and its documentation,
+ * even if Peter Stephenson and the Zsh Development Group have been advised of
+ * the possibility of such damage.
+ *
+ * Peter Stephenson and the Zsh Development Group specifically disclaim any
+ * warranties, including, but not limited to, the implied warranties of
+ * merchantability and fitness for a particular purpose.  The software
+ * provided hereunder is on an "as is" basis, and Peter Stephenson and the
+ * Zsh Development Group have no obligation to provide maintenance,
+ * support, updates, enhancements, or modifications.
+ */
+
+#include "zsh.mdh"
+
+/**/
+mod_export char *
+dupstring(const char *s)
+{
+    char *t;
+
+    if (!s)
+	return NULL;
+    t = (char *) zhalloc(strlen((char *)s) + 1);
+    strcpy(t, s);
+    return t;
+}
+
+/* Duplicate string on heap when length is known */
+
+/**/
+mod_export char *
+dupstring_wlen(const char *s, unsigned len)
+{
+    char *t;
+
+    if (!s)
+	return NULL;
+    t = (char *) zhalloc(len + 1);
+    memcpy(t, s, len);
+    t[len] = '\0';
+    return t;
+}
+
+/* Duplicate string on heap, returning length of string */
+
+/**/
+mod_export char *
+dupstring_glen(const char *s, unsigned *len_ret)
+{
+    char *t;
+
+    if (!s)
+	return NULL;
+    t = (char *) zhalloc((*len_ret = strlen((char *)s)) + 1);
+    strcpy(t, s);
+    return t;
+}
+
+/**/
+mod_export char *
+ztrdup(const char *s)
+{
+    char *t;
+
+    if (!s)
+	return NULL;
+    t = (char *)zalloc(strlen((char *)s) + 1);
+    strcpy(t, s);
+    return t;
+}
+
+/**/
+#ifdef MULTIBYTE_SUPPORT
+/**/
+mod_export wchar_t *
+wcs_ztrdup(const wchar_t *s)
+{
+    wchar_t *t;
+
+    if (!s)
+	return NULL;
+    t = (wchar_t *)zalloc(sizeof(wchar_t) * (wcslen((wchar_t *)s) + 1));
+    wcscpy(t, s);
+    return t;
+}
+/**/
+#endif /* MULTIBYTE_SUPPORT */
+
+
+/* concatenate s1, s2, and s3 in dynamically allocated buffer */
+
+/**/
+mod_export char *
+tricat(char const *s1, char const *s2, char const *s3)
+{
+    /* This version always uses permanently-allocated space. */
+    char *ptr;
+    size_t l1 = strlen(s1);
+    size_t l2 = strlen(s2);
+
+    ptr = (char *)zalloc(l1 + l2 + strlen(s3) + 1);
+    strcpy(ptr, s1);
+    strcpy(ptr + l1, s2);
+    strcpy(ptr + l1 + l2, s3);
+    return ptr;
+}
+
+/**/
+mod_export char *
+zhtricat(char const *s1, char const *s2, char const *s3)
+{
+    char *ptr;
+    size_t l1 = strlen(s1);
+    size_t l2 = strlen(s2);
+
+    ptr = (char *)zhalloc(l1 + l2 + strlen(s3) + 1);
+    strcpy(ptr, s1);
+    strcpy(ptr + l1, s2);
+    strcpy(ptr + l1 + l2, s3);
+    return ptr;
+}
+
+/* concatenate s1 and s2 in dynamically allocated buffer */
+
+/**/
+mod_export char *
+dyncat(const char *s1, const char *s2)
+{
+    /* This version always uses space from the current heap. */
+    char *ptr;
+    size_t l1 = strlen(s1);
+
+    ptr = (char *)zhalloc(l1 + strlen(s2) + 1);
+    strcpy(ptr, s1);
+    strcpy(ptr + l1, s2);
+    return ptr;
+}
+
+/**/
+mod_export char *
+bicat(const char *s1, const char *s2)
+{
+    /* This version always uses permanently-allocated space. */
+    char *ptr;
+    size_t l1 = strlen(s1);
+
+    ptr = (char *)zalloc(l1 + strlen(s2) + 1);
+    strcpy(ptr, s1);
+    strcpy(ptr + l1, s2);
+    return ptr;
+}
+
+/* like dupstring(), but with a specified length */
+
+/**/
+mod_export char *
+dupstrpfx(const char *s, int len)
+{
+    char *r = zhalloc(len + 1);
+
+    memcpy(r, s, len);
+    r[len] = '\0';
+    return r;
+}
+
+/**/
+mod_export char *
+ztrduppfx(const char *s, int len)
+{
+    /* This version always uses permanently-allocated space. */
+    char *r = zalloc(len + 1);
+
+    memcpy(r, s, len);
+    r[len] = '\0';
+    return r;
+}
+
+/* Append a string to an allocated string, reallocating to make room. */
+
+/**/
+mod_export char *
+appstr(char *base, char const *append)
+{
+    return strcat(realloc(base, strlen(base) + strlen(append) + 1), append);
+}
+
+/* Return a pointer to the last character of a string,
+   unless the string is empty. */
+
+/**/
+mod_export char *
+strend(char *str)
+{
+    if (*str == '\0')
+	return str;
+    return str + strlen (str) - 1;
+}