feat: add fullscreen TUI and project updates

- New TUI screens: Main Menu, Compile, Run, REPL, AI Generator, AI Settings, Help
- AI configuration persisted in ~/.config/cljnim/config.json
- Added illwill dependency for terminal UI
- Updated experiments, examples, docs, and core modules

experiments/web-target/build/math.nim

@@ -0,0 +1,12 @@
+# Generated by Clojure/Nim
+import cljnim_runtime_js
+
+proc square*(x: CljVal): CljVal =
+  cljMul(@[x, x])
+proc factorial*(n: CljVal): CljVal =
+  if cljIsTruthy(cljNumEq(@[n, cljInt(0)])):
+    result = cljInt(1)
+  else:
+    result = cljMul(@[n, factorial(cljSub(@[n, cljInt(1)]))])
+proc greet*(name: CljVal): CljVal =
+  cljStrConcat(@[cljString("Hello, "), name, cljString("!")])