Prepare GitHub alpha launch (README, CI, tests, release workflow)

.github/pull_request_template.md

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+## Summary
+
+Describe what changed and why.
+
+## Type of Change
+
+- [ ] Feature
+- [ ] Fix
+- [ ] Refactor
+- [ ] Docs
+- [ ] CI / Build
+
+## What Was Tested
+
+- [ ] `cargo fmt --check`
+- [ ] `cargo clippy --all-targets --all-features -- -D warnings`
+- [ ] `cargo test`
+- [ ] `cargo check`
+- [ ] Manual smoke test (`build` / `list` / `remove`) when behavior changed
+
+## Behavior / Risk Notes
+
+List any edge cases, compatibility impacts, or known limitations.
+
+## Screenshots (if relevant)
+
+Only needed when desktop integration behavior/UI-visible changes are involved.

.github/release.yml

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+changelog:
+  categories:
+    - title: Features
+      labels:
+        - feature
+        - enhancement
+    - title: Fixes
+      labels:
+        - fix
+        - bug
+    - title: Documentation
+      labels:
+        - docs
+    - title: Maintenance
+      labels:
+        - chore
+        - ci
+  exclude:
+    labels:
+      - skip-changelog

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  checks:
+    name: Rust Checks
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+
+      - name: Cache cargo artifacts
+        uses: Swatinem/rust-cache@v2
+
+      - name: Format check
+        run: cargo fmt --check
+
+      - name: Clippy
+        run: cargo clippy --all-targets --all-features -- -D warnings
+
+      - name: Unit tests
+        run: cargo test
+
+      - name: Cargo check
+        run: cargo check

.github/workflows/release.yml

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+name: Release
+
+on:
+  push:
+    tags:
+      - "v*"
+
+permissions:
+  contents: write
+
+jobs:
+  build-linux:
+    name: Build Linux Binary
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache cargo artifacts
+        uses: Swatinem/rust-cache@v2
+
+      - name: Build release binary
+        run: cargo build --release
+
+      - name: Prepare release asset
+        run: |
+          mkdir -p dist
+          cp target/release/deskify dist/deskify-linux-x86_64
+
+      - name: Upload GitHub Release asset
+        uses: softprops/action-gh-release@v2
+        with:
+          files: dist/deskify-linux-x86_64
+          generate_release_notes: true