chore: add AppImage release packaging

README.md

@@ -52,8 +52,6 @@ uv run scanslicer --backend x11
 
 ### Run with Python directly
 
-The package directory now matches the published name:
-
 ```bash
 python -m scanslicer
 ```
@@ -110,8 +108,6 @@ Environment variable overrides:
 - `SCANSLICER_FEEDBACK_PATH`
 - `SCANSLICER_STATUS_LOG_PATH`
 
-Legacy override names are still accepted for backward compatibility.
-
 ## Docker Compose
 
 The repo includes a GUI-oriented compose setup for Linux desktop use:
@@ -133,21 +129,21 @@ Detailed instructions: `docs/appimage.md`.
 
 ## Documentation
 
-- `docs/README.md` - documentation index
-- `docs/user-guide.md` - end-user operation guide
-- `docs/architecture.md` - code architecture and execution flow
-- `docs/parameters.md` - full detection parameter reference
-- `docs/autotune.md` - auto-tune and feedback internals
+- `docs/README.md`         - documentation index
+- `docs/user-guide.md`     - end-user operation guide
+- `docs/architecture.md`   - code architecture and execution flow
+- `docs/parameters.md`     - full detection parameter reference
+- `docs/autotune.md`       - auto-tune and feedback internals
 - `docs/runtime-config.md` - backend/environment and persistence paths
-- `docs/appimage.md` - AppImage packaging details
-- `docs/development.md` - contributor-focused architecture/workflow notes
+- `docs/appimage.md`       - AppImage packaging details
+- `docs/development.md`    - contributor-focused architecture/workflow notes
 
 ## Repository Layout
 
 ```text
-scanslicer/                  Application source (UI, controllers, canvas, detection)
-packaging/appimage/           AppImage recipe and build scripts
-Dockerfile                    Runtime image
-docker-compose.yml            GUI container runtime wiring
-pyproject.toml                Python package metadata and dependencies
+scanslicer/                - Application source (UI, controllers, canvas, detection)
+packaging/appimage/        - AppImage recipe and build scripts
+Dockerfile                 - Runtime image
+docker-compose.yml         - GUI container runtime wiring
+pyproject.toml             - Python package metadata and dependencies
 ```