feat(identity): rename user-visible identity to voculinux with one-time legacy import

The fork takes its own name everywhere a user can see it: binaries
(voculinux, voculinux-gui), desktop entry, autostart, tray, D-Bus
namespace (com.voculinux.Voculinux, no alias for the old name),
config/data/cache dirs, single-instance lock, IBus engine identity,
tray icons, resource prefixes, VOCULINUX_* environment names, and the
update-checker user agent. The internal Python module stays vocalinux
and the distribution metadata keeps the upstream URLs as provenance.

On first run a previous Vocalinux install's config.json, custom
dictionary, and portal restore token are copied once into the new
locations (new config always wins, no merge, no write-back); models
re-resolve through the pinned-checksum download path. An offline
naming-sweep test proves no old-name strings remain on user-visible
surfaces outside the allowlist.

Refs #18

tests/distro-testing-checklist.md

@@ -1,6 +1,6 @@
 # Distribution Testing Checklist
 
-Use this checklist when testing Vocalinux on a new Linux distribution.
+Use this checklist when testing Voculinux on a new Linux distribution.
 
 ## Pre-Installation
 
@@ -51,22 +51,22 @@ Use this checklist when testing Vocalinux on a new Linux distribution.
 - [ ] Check for errors during installation
 - [ ] Verify virtual environment was created
   ```bash
-  ls -la ~/.local/share/vocalinux/venv/
+  ls -la ~/.local/share/voculinux/venv/
   ```
 
 - [ ] Check wrapper scripts exist
   ```bash
-  ls -la ~/.local/bin/vocalinux*
+  ls -la ~/.local/bin/voculinux*
   ```
 
 - [ ] Check desktop entry was created
   ```bash
-  ls -la ~/.local/share/applications/vocalinux.desktop
+  ls -la ~/.local/share/applications/voculinux.desktop
   ```
 
 - [ ] Check icons were installed
   ```bash
-  ls -la ~/.local/share/icons/hicolor/scalable/apps/vocalinux*
+  ls -la ~/.local/share/icons/hicolor/scalable/apps/voculinux*
   ```
 
 ## Post-Installation
@@ -74,7 +74,7 @@ Use this checklist when testing Vocalinux on a new Linux distribution.
 ### Launch from Terminal
 - [ ] Launch from terminal
   ```bash
-  ~/.local/bin/vocalinux-gui
+  ~/.local/bin/voculinux-gui
   ```
 
 - [ ] Check for startup errors
@@ -154,7 +154,7 @@ Use this checklist when testing Vocalinux on a new Linux distribution.
 - [ ] Settings persist after restart
 - [ ] Config file is created correctly
   ```bash
-  cat ~/.config/vocalinux/config.json
+  cat ~/.config/voculinux/config.json
   ```
 
 ### Model Download (if using Whisper)
@@ -162,7 +162,7 @@ Use this checklist when testing Vocalinux on a new Linux distribution.
 - [ ] Download progress is shown
 - [ ] Model is saved to correct location
   ```bash
-  ls -la ~/.local/share/vocalinux/models/
+  ls -la ~/.local/share/voculinux/models/
   ```
 
 ### Error Handling
@@ -179,7 +179,7 @@ Use this checklist when testing Vocalinux on a new Linux distribution.
 - [ ] Memory usage is reasonable
   ```bash
   # Check memory usage
-  ps aux | grep vocalinux
+  ps aux | grep voculinux
   ```
 
 - [ ] CPU usage is reasonable during idle
@@ -190,17 +190,17 @@ Use this checklist when testing Vocalinux on a new Linux distribution.
 - [ ] Application can be quit cleanly
 - [ ] No processes left running
   ```bash
-  ps aux | grep vocalinux
+  ps aux | grep voculinux
   ```
 
 - [ ] Uninstallation works
   ```bash
-  bash ~/.local/share/vocalinux/uninstall.sh  # if exists
+  bash ~/.local/share/voculinux/uninstall.sh  # if exists
   # or manual cleanup
-  rm -rf ~/.local/share/vocalinux
-  rm -rf ~/.config/vocalinux
-  rm ~/.local/share/applications/vocalinux.desktop
-  rm ~/.local/bin/vocalinux*
+  rm -rf ~/.local/share/voculinux
+  rm -rf ~/.config/voculinux
+  rm ~/.local/share/applications/voculinux.desktop
+  rm ~/.local/bin/voculinux*
   ```
 
 ## Known Issues
@@ -262,7 +262,7 @@ After completing the checklist:
 3. **Attach logs** if there were errors:
    - Installer output
    - Application output from terminal
-   - Journal logs: `journalctl --user -u vocalinux -b`
+   - Journal logs: `journalctl --user -u voculinux -b`
 
 4. **Mention any workarounds** you found
 
@@ -293,13 +293,13 @@ pactl list sources short  # PulseAudio
 arecord -l                 # ALSA
 
 # Check for running processes
-ps aux | grep vocalinux
+ps aux | grep voculinux
 
 # Check memory usage
-ps aux | grep vocalinux | awk '{print $6}'
+ps aux | grep voculinux | awk '{print $6}'
 
 # Check logs
-journalctl --user -b | grep vocalinux
+journalctl --user -b | grep voculinux
 
 # Run dependency checker
 bash scripts/check-system-deps.sh
@@ -308,7 +308,7 @@ bash scripts/check-system-deps.sh
 bash -n install.sh
 
 # Verify installation
-ls -la ~/.local/bin/vocalinux*
-ls -la ~/.local/share/vocalinux/
-ls -la ~/.config/vocalinux/
+ls -la ~/.local/bin/voculinux*
+ls -la ~/.local/share/voculinux/
+ls -la ~/.config/voculinux/
 ```