rename node to dora-image-view

The repository, the Python package, the entrypoint and the manifest name all
now agree. `plot` was carried over from the upstream opencv-plot node and no
longer described anything here, so the module, the class and the environment
variables follow the node:

  dora_plot/         -> dora_image_view/
  dora_plot/plot.py  -> dora_image_view/view.py
  Plot               -> View
  PLOT_WIDTH/HEIGHT  -> VIEW_WIDTH/HEIGHT
  --plot-width/-height -> --view-width/-height

Breaking for anyone wiring `path: dora-plot` or setting PLOT_WIDTH; nothing is
tagged yet.

dora-node.yml

@@ -5,14 +5,14 @@
 # dataflow against it without running the node, so CI needs neither OpenCV nor
 # a display.
 apiVersion: 1
-name: dora-plot
+name: dora-image-view
 namespace: liria
 description: Overlays bounding boxes, labels, and text on an image input and displays it in an OpenCV window
 categories: [visualization, debug]
-keywords: [opencv, plot, bbox, bounding-box, image, visualization, object-detection]
+keywords: [opencv, view, bbox, bounding-box, image, visualization, object-detection]
 
 runtime: python
-entrypoint: dora-plot
+entrypoint: dora-image-view
 # `dora build --uv` / `dora run --uv` rewrites this to `uv pip install .` and
 # gives the node its own managed venv under `.dora/python-envs/`, so the
 # dependencies it sees at runtime are the ones installed here.
@@ -45,19 +45,19 @@ inputs:
 outputs: {}
 
 env:
-  PLOT_WIDTH:
+  VIEW_WIDTH:
     type: int
     description: Resize the displayed frame to this width (pixels). Defaults to the image input width.
-  PLOT_HEIGHT:
+  VIEW_HEIGHT:
     type: int
     description: Resize the displayed frame to this height (pixels). Defaults to the image input height.
 
 example: |
-  - id: plot
-    git: ssh://git@gitea.liria.cl:5001/liria/dora-plot.git
+  - id: view
+    git: ssh://git@gitea.liria.cl:5001/liria/dora-image-view.git
     tag: v0.1.0
     build: pip install .
-    path: dora-plot
+    path: dora-image-view
     inputs:
       image: camera/image
       bbox: detector/bbox