Migrate from rust-htslib to noodles (pure Rust)

Replace the C htslib dependency with noodles, a pure Rust
bioinformatics I/O library. This eliminates all C compilation
requirements, enabling Windows builds and removing the glib
vulnerability from Cargo.lock.

Changes:
- read_count.rs: noodles BAM indexed reader + CIGAR ops
- io/vcf.rs: text-based VCF/VCF.GZ reader (BGZF via noodles)
- output/vcf.rs: noodles BGZF writer, tabix via external command
- pipeline/processing.rs: noodles BAM reader in worker threads
- src-tauri/commands.rs: noodles BAM viewer, custom FASTA reader
- error.rs: removed htslib error conversion

Dropped:
- rust-htslib dependency (both crates)
- bio dependency (src-tauri)
- BCF input support (rare; use bcftools view to convert)
- Built-in tabix indexing (uses external tabix command)

Added:
- noodles 0.109 (bam, bgzf, vcf, bcf, csi, tabix, sam, core)
- Windows build target in release workflow

224 tests passing, 0 clippy warnings.

Author: Paururo

.github/workflows/release.yml

@@ -24,6 +24,9 @@ jobs:
           - platform: ubuntu-22.04
             rust_target: x86_64-unknown-linux-gnu
             args: "--target x86_64-unknown-linux-gnu"
+          - platform: windows-latest
+            rust_target: x86_64-pc-windows-msvc
+            args: "--target x86_64-pc-windows-msvc"
 
     runs-on: ${{ matrix.platform }}
 
@@ -57,14 +60,41 @@ jobs:
             libayatana-appindicator3-dev \
             librsvg2-dev \
             patchelf \
-            libfuse2 \
-            libbz2-dev \
-            liblzma-dev \
-            libcurl4-openssl-dev \
-            libssl-dev \
-            zlib1g-dev \
-            autoconf \
-            automake
+            libfuse2
+
+      - name: Setup Python (Windows only)
+        if: matrix.platform == 'windows-latest'
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Generate Windows .ico
+        if: matrix.platform == 'windows-latest'
+        shell: pwsh
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install pillow
+          $py = @(
+            'from PIL import Image',
+            'from pathlib import Path',
+            'png = Path("src-tauri/icons/icon.png")',
+            'ico = Path("src-tauri/icons/icon.ico")',
+            'if not png.exists(): raise SystemExit(f"Missing {png}")',
+            'ico.parent.mkdir(parents=True, exist_ok=True)',
+            'img = Image.open(png).convert("RGBA")',
+            'sizes = [(16,16),(24,24),(32,32),(48,48),(64,64),(256,256)]',
+            'img.save(ico, format="ICO", sizes=sizes)',
+            'print(f"Generated {ico}")'
+          )
+          $py | Set-Content -Encoding utf8 gen_ico.py
+          python gen_ico.py
+          $confPath = "src-tauri/tauri.conf.json"
+          $json = Get-Content $confPath -Raw | ConvertFrom-Json
+          if (-not $json.bundle.icon) { $json.bundle.icon = @() }
+          if ($json.bundle.icon -notcontains "icons/icon.ico") {
+            $json.bundle.icon += "icons/icon.ico"
+          }
+          $json | ConvertTo-Json -Depth 100 | Set-Content -Encoding utf8 $confPath
 
       - name: Install and build frontend
         run: |