v1.0.0: merge container (scrollbox + tabbar) into cl-tty.box

Eliminates the cl-tty.container package by merging scrollbox and tabbar
components directly into cl-tty.box, where the component system lives.

Changes:
- added scrollbox/tabbar exports to cl-tty.box defpackage in package.org
- changed scrollbox.org in-package from cl-tty.container to cl-tty.box
- changed tabbar.org in-package from cl-tty.container to cl-tty.box
- tabbar's key-event-key references are qualified with cl-tty.input:
  (avoids circular :use dependency with cl-tty.input which :uses cl-tty.box)
- deleted container-package.org
- updated test packages, integration tests, scripts, ASDF
- all 14 test suites pass at 100%

org/package.org

@@ -175,6 +175,15 @@ means themes can be swapped without touching component instances.
 #+BEGIN_SRC lisp :tangle ~/.local/share/cl-tty/src/components/package.lisp
    ;; Theme engine
    #:theme #:make-theme #:theme-mode
-   #:theme-color #:load-preset #:define-preset))
-(in-package :cl-tty.box)
+   #:theme-color #:load-preset #:define-preset
+   ;; Container components (merged from cl-tty.container)
+   #:scroll-box #:make-scroll-box
+   #:scroll-box-scroll-y #:scroll-box-scroll-x
+   #:scroll-box-children
+   #:scroll-by #:sticky-scroll-p
+   #:clamp-scroll
+   #:tab-bar #:make-tab-bar
+   #:tab-bar-active #:tab-bar-tabs
+   #:tab-bar-add #:tab-bar-next #:tab-bar-prev
+   #:tab-bar-select #:tab-bar-handle-key))
 #+END_SRC