Rename LabDAQ → LabUI and overhaul plugin system

Branding:
- Rename app, window title, file extension (.labdaq → .labui), user data
  dirs (~/.labui/), spec file (labdaq.spec → labui.spec), and APP_NAME
  throughout all source, docs, and config files

Plugin system:
- Plugins no longer bundled in the PyInstaller build — installed at
  runtime by users via Settings → Plugins → Install Plugin (zip)
- PluginManager now takes user_dir + extra_scan_dirs; user plugins live
  in ~/.labui/plugins/, dev scan additionally covers project plugins/
- install_from_zip / uninstall / is_user_installed added to PluginManager
- vendor/ dir inside plugin zips: prepended to sys.path at load time so
  plugins can ship their own deps without requiring pip on end-user machine
- source_url field in manifest.json: shown as Download button in the
  missing-plugins dialog when a profile requires an absent plugin
- Frozen-app pip install now targets ~/.labui/plugin_packages/ using a
  real system Python (sys.executable is the exe in frozen builds)

Profile loading:
- Profile now stores plugins_manifest snapshot (id, name, version,
  source_url) alongside plugins_enabled
- On load, missing or dep-broken plugins trigger MissingPluginsDialog
  before the rest of the profile is applied; user can install from zip
  or download via source_url in-dialog, or cancel the load
- Plugin reconciliation only enables installed plugins — missing ones
  are not written to enabled.json

UI:
- Version label added to status bar (bottom-right, muted colour)
- Settings → Plugins tab: Install Plugin… button, per-plugin Remove
  button for user-installed plugins, live list refresh after install/remove

Docs:
- New docs/building.md covers the full release pipeline
- docs/plugin-development.md updated for new install flow, vendoring,
  source_url, profile behaviour, and distribution instructions

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/scripts/release/repo_init.py b/scripts/release/repo_init.py
index 04c3579..ccbfe17 100644
--- a/scripts/release/repo_init.py
+++ b/scripts/release/repo_init.py
@@ -3,7 +3,7 @@ scripts/release/repo_init.py
 
 Run ONCE, ever, by the maintainer, locally. Generates the TUF signing keys
 and the initial repository metadata (including root.json, which later gets
-bundled into the app via labdaq.spec).
+bundled into the app via labui.spec).
 
 Running this again after the repo already exists is safe (tufup skips
 re-creating keys/roles that already exist) but there is normally no reason
@@ -24,7 +24,7 @@ from tufup.repo import Repository, RolesDict
 # directory, so invocation location must be consistent every time.
 os.chdir(Path(__file__).resolve().parent)
 
-APP_NAME = "labdaq"
+APP_NAME = "labui"
 
 # tufup-example's 1-day timestamp / 7-day snapshot defaults assume an
 # automated CI worker re-signs on a schedule. We're signing manually