fix(preservation): keep vinput config and models across reboots (#381)

Vinput stores its core config in ~/.config/vinput/config.json and its
downloaded sherpa-onnx models in ~/.local/share/vinput/models/. Neither
was bind-mounted from /persistent on the tmpfs-root hosts, so a reboot
wiped both and vinput-daemon started with "Local ASR provider model is
not configured". Persist both directories and document the one-shot CLI
model setup in the vinput README.

home/linux/gui/base/vinput/README.md

@@ -1,19 +1,43 @@
 # Fcitx5 Vinput
 
-On `ai` and `shoukei`, install a Sherpa-ONNX model in Vinput under **Resources → Models**, then
-select it in **Control → ASR Providers**. Hold and release **right Alt** to dictate. **Right Shift**
-toggles Chinese/English; **left Shift** remains a normal modifier. Open Vinput from the application
-launcher for settings.
+On `ai` and `shoukei`, install a Sherpa-ONNX model, then hold and release **right Alt** to dictate.
+**Right Shift** toggles Chinese/English; **left Shift** remains a normal modifier. Open Vinput from
+the application launcher for settings.
 
-Models are stored in `~/.local/share/vinput/models/sherpa-onnx/`. Review their source and license
-before installing.
+## One-time setup (CLI)
+
+The GUI path is **Resources → Models** (download and activate), then **Control → ASR Providers**.
+The equivalent non-interactive commands are:
+
+```sh
+vinput model add onnx-xasr-zh-en-960ms-punct-stream   # download (~130 MB, sha256-verified)
+vinput model use onnx-xasr-zh-en-960ms-punct-stream   # set as active model
+systemctl --user restart vinput-daemon
+```
+
+`vinput model list -a` lists the available registry models.
 
 ## Backends
 
 - `shoukei` uses CPU. Leave the model's provider at its default.
 - `ai` uses OpenVINO when the model's `vinput-model.json` sets `"provider": "openvino"`; restart
-  `vinput-daemon` after changing it. The user needs the `render` group and a new login after
-  deployment.
+  `vinput-daemon` after changing it. One-shot enable:
+
+  ```sh
+  f=~/.local/share/vinput/models/sherpa-onnx/x-asr-960ms-streaming-zipformer-transducer-zh-en-punct-int8/vinput-model.json
+  jq '.model.provider = "openvino"' "$f" | tee "$f.tmp" && mv "$f.tmp" "$f"
+  systemctl --user restart vinput-daemon
+  ```
+
+  The user needs the `render` group and a new login after deployment.
+
+## Persistence
+
+Models are stored in `~/.local/share/vinput/models/sherpa-onnx/` and the core config lives in
+`~/.config/vinput/config.json`. Both directories are bind-mounted from `/persistent` on the
+tmpfs-root hosts (see `hosts/idols-ai/preservation.nix`); without that they are wiped on every
+reboot and the daemon logs `Local ASR provider model is not configured`. Review model source and
+license before installing.
 
 **NPU execution status: unverified.** On `ai`, the OpenVINO runtime and NPU plugin load, the daemon
 opens `/dev/accel/accel0`, and the bundled WAV sample transcribes. However, the NPU busy-time

hosts/idols-ai/preservation.nix

@@ -355,6 +355,13 @@ in
         # Japanese IME
         ".config/mozc" # used by fcitx5-mozc
 
+        # Vinput voice input (fcitx5-vinput): core config.json + downloaded
+        # sherpa-onnx models (~/.local/share/vinput/models/). Without these the
+        # daemon starts with "Local ASR provider model is not configured" after
+        # every reboot. Setup commands: home/linux/gui/base/vinput/README.md
+        ".config/vinput"
+        ".local/share/vinput"
+
         ".config/nushell"
       ];
       files = [