feat: integrate site prefix column from Netbox-Prefixes

Device and rack tables show the first word of the site name as the
first data column. Replaces the separate netbox_site_prefix plugin and
can be disabled with site_prefix_column_enabled.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

netbox_utilities/site_prefix.py

@@ -0,0 +1,43 @@
+import django_tables2 as tables
+
+COLUMN_NAME = "site_prefix"
+
+
+def first_word(value):
+    """Return the first whitespace-delimited word of a value."""
+    words = str(value or "").split()
+    return words[0] if words else None
+
+
+class SitePrefixColumn(tables.Column):
+    """Render the first word of a record's site name."""
+
+    def render(self, value):
+        if value is None:
+            return None
+        return first_word(value.name)
+
+
+def prepend_to_default_columns(table):
+    """Show the prefix column first for users without saved table preferences."""
+    defaults = tuple(table.Meta.default_columns)
+    table.Meta.default_columns = (
+        "pk",
+        COLUMN_NAME,
+        *(name for name in defaults if name not in {"pk", COLUMN_NAME}),
+    )
+
+
+def install_site_prefix_column():
+    from dcim.tables import DeviceTable, RackTable
+    from utilities.tables import register_table_column
+
+    column = SitePrefixColumn(
+        accessor=tables.A("site"),
+        verbose_name="Prefix",
+        empty_values=(),
+        orderable=False,
+    )
+    register_table_column(column, COLUMN_NAME, DeviceTable, RackTable)
+    prepend_to_default_columns(DeviceTable)
+    prepend_to_default_columns(RackTable)