Refactor to Cargo Workspace (#129)

* Refactor project into a Cargo workspace with distinct packages

- Created a root `Cargo.toml` defining a workspace.
- Moved `src/types` and `src/utils` into a new `pwsp-lib` crate for shared logic.
- Split binaries into their own crates: `pwsp-daemon`, `pwsp-cli`, and `pwsp-gui`.
- Shifted all dependencies into `[workspace.dependencies]` for centralized version management.
- Updated import paths across all crates (e.g. from `pwsp::` to `pwsp_lib::`).
- Updated build scripts, GitHub actions, Flatpak manifest, and AUR PKGBUILD to support the new workspace structure.
- Ensured no core application logic was altered.

Co-authored-by: arabianq <55220741+arabianq@users.noreply.github.com>

* Fix cargo-deb build process in GitHub actions for workspace architecture

Co-authored-by: arabianq <55220741+arabianq@users.noreply.github.com>

* Fix cargo-deb asset discovery by using exact target/release paths

Co-authored-by: arabianq <55220741+arabianq@users.noreply.github.com>

* refactor deps in Cargo.toml files

* fix incorrect assets path

---------

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

.github/workflows/build.yml

@@ -42,7 +42,7 @@ jobs:
         run: |
           set -euo pipefail
           BIN_NAMES=$(cargo metadata --no-deps --format-version 1 \
-            | jq -r '.packages[0].targets[] | select(.kind[] | contains("bin")) | .name')
+            | jq -r '.packages[].targets[] | select(.kind[] | contains("bin")) | .name')
           echo "bin_names<<EOF" >> $GITHUB_OUTPUT
           echo "$BIN_NAMES" >> $GITHUB_OUTPUT
           echo "EOF" >> $GITHUB_OUTPUT
@@ -93,7 +93,8 @@ jobs:
           cargo install --locked cargo-deb
           export PATH="$HOME/.cargo/bin:$PATH"
 
-          cargo-deb
+          cargo build --release --locked
+          cargo-deb -p pwsp-gui
 
       - name: Upload .deb(s) as artifacts
         uses: actions/upload-artifact@v4