Migrate to AES-256-XTS, KDF & WebDAV improvements

Replace AES-CTR with AES-256-XTS cipher implementation and tests; update KDF to derive 64-byte keys for XTS. Integrate file cache into WebDAV filesystem, improve file read/write/flush error handling, and make WebDAV use the XTS cipher. Add cross-platform OS helpers to auto-open/mount the DAV endpoint (linux/macos/windows) and graceful shutdown with signal handling in main.rs. Add a GitHub release workflow and include secure_volume assets. Update Cargo.toml to add xts-mode and dashmap and adjust related deps.

Author: g3noce

.github/workflows/release.yml

@@ -0,0 +1,40 @@
+name: Build Release Binaries
+
+on:
+  push:
+    tags:
+      - 'v*' # Se lance quand vous créez un tag type "v1.0"
+
+jobs:
+  build:
+    name: Build on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        include:
+          - os: windows-latest
+            target: x86_64-pc-windows-msvc
+            name: dspv-windows.exe
+          - os: ubuntu-latest
+            target: x86_64-unknown-linux-gnu
+            name: dspv-linux
+          - os: macos-latest
+            target: x86_64-apple-darwin
+            name: dspv-macos
+
+    steps:
+    - uses: actions/checkout@v3
+    
+    - name: Install Rust
+      uses: dtolnay/rust-toolchain@stable
+      with:
+        targets: ${{ matrix.target }}
+
+    - name: Build target
+      run: cargo build --release --target ${{ matrix.target }}
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v3
+      with:
+        name: ${{ matrix.name }}
+        path: target/${{ matrix.target }}/release/Dynamic-Secure-Portable-Volume${{ matrix.os == 'windows-latest' && '.exe' || '' }}