Catch missed content edits from tree restructure

The fe39fcb commit captured the file moves (git mv stages those automatically)
but didn't catch the content edits I made afterward — npm package rename
(@mizan/runtime → @mizan/base), path updates in Makefile/Dockerfile/examples,
and doc updates were all left unstaged at commit time.

This commit lands those:
- npm rename: 3 frontend package.jsons (base/vue/svelte) + mizan-base/src/index.ts + 4 codegen templates
- path updates: Makefile, Dockerfile.test, two Gitea workflows, four example/harness configs
- doc updates: CLAUDE.md, ROADMAP.md, ISSUES.md, docs/AFI_ARCHITECTURE.md

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

examples/django-react-site/harness/django.config.mjs

@@ -10,9 +10,9 @@ export default {
     source: {
         django: {
             managePath: path.join(root, 'examples/django-react-site/backend/manage.py'),
-            command: [path.join(root, 'packages/mizan-django/.venv/bin/python')],
+            command: [path.join(root, 'backends/mizan-django/.venv/bin/python')],
             env: {
-                PYTHONPATH: `${path.join(root, 'packages/mizan-django/src')}:${path.join(root, 'examples/django-react-site/backend')}`,
+                PYTHONPATH: `${path.join(root, 'backends/mizan-django/src')}:${path.join(root, 'examples/django-react-site/backend')}`,
                 DJANGO_SETTINGS_MODULE: 'testapp.settings',
             },
         },