feat!: change thesis-type to accept short keys (bachelor/course/qualification)

BREAKING CHANGE: thesis-type now requires "bachelor", "course", or
"qualification" instead of full labels like "Bakalaura darbs". Update
existing documents to use the new format.

examples/qualification-thesis/main.typ

@@ -1,5 +1,5 @@
 #import "@preview/fletcher:0.5.8" as fletcher: diagram, edge, node
-#import "@preview/solo-lu-df:1.0.0": *
+#import "@preview/solo-lu-df:1.1.0": *
 #import "utils/diagrams.typ": data-store, dpd-database, dpd-edge, process
 #import "utils/tables.typ": function-table
 
@@ -8,7 +8,7 @@
 
 #show: ludf.with(
   title: "Darba Nosaukums",
-  thesis-type: "Kvalifikācijas Darbs",
+  thesis-type: "qualification",
   authors: (
     (
       name: "Jānis Bērziņš",