chore: CI/build improvements and version detection

- Rename GITEA_TOKEN to DEPLOY_TOKEN in release workflow
- Extract shared version detection into build-common.sh
- Use importlib.metadata for runtime version instead of hardcoded string
- Use PEP 440 parsing (packaging lib) for update version comparison
- Add packaging>=23.0 to dependencies
- Fix update banner close button alignment (CSS)
- Update CLAUDE.md with versioning docs and frontend rebuild notes

build-common.sh

@@ -0,0 +1,103 @@
+#!/usr/bin/env bash
+# build-common.sh — shared functions for platform build scripts
+# Source this file, do not execute directly.
+
+# --- Version detection ---
+# Fallback chain: CLI arg → git tag → CI env var → pyproject.toml
+detect_version() {
+    local arg="${1:-}"
+    VERSION="${arg}"
+
+    if [ -z "$VERSION" ]; then
+        VERSION=$(git describe --tags --exact-match 2>/dev/null || true)
+    fi
+
+    if [ -z "$VERSION" ]; then
+        VERSION="${GITEA_REF_NAME:-${GITHUB_REF_NAME:-}}"
+    fi
+
+    if [ -z "$VERSION" ]; then
+        VERSION=$(grep -oP '^version\s*=\s*"\K[^"]+' \
+          pyproject.toml 2>/dev/null || echo "0.0.0")
+    fi
+
+    VERSION_CLEAN="${VERSION#v}"
+
+    # Stamp version into pyproject.toml (single source of truth)
+    sed -i "s/^version = .*/version = \"${VERSION_CLEAN}\"/" pyproject.toml
+}
+
+# --- Clean dist/build directories ---
+clean_dist() {
+    rm -rf dist build
+    mkdir -p "$@"
+}
+
+# --- Verify frontend bundle exists ---
+verify_frontend() {
+    if [ ! -f "media_server/static/dist/app.bundle.js" ]; then
+        echo "ERROR: Frontend bundle not found. Run 'npm ci && npm run build' first."
+        exit 1
+    fi
+}
+
+# --- Copy application files into dist ---
+# Args: $1 = DIST_DIR
+copy_app_files() {
+    local dist_dir="$1"
+
+    echo "Copying application files..."
+    mkdir -p "${dist_dir}/app"
+    cp -r media_server "${dist_dir}/app/"
+
+    # Remove source JS (bundle is in dist/)
+    rm -rf "${dist_dir}/app/media_server/static/js"
+    # Remove source maps from release
+    rm -f "${dist_dir}/app/media_server/static/dist/"*.map
+
+    # Copy config example
+    cp config.example.yaml "${dist_dir}/"
+
+    # Write version file
+    echo "$VERSION_CLEAN" > "${dist_dir}/VERSION"
+}
+
+# --- Clean up site-packages for smaller distribution ---
+# Args: $1 = site-packages path, $2 = ext suffix (pyd|so), $3 = lib suffix (dll|so)
+# Windows: cleanup_site_packages "$SP" "pyd" "dll"
+# Linux:   cleanup_site_packages "$SP" "so"  "so"
+cleanup_site_packages() {
+    local sp_dir="$1"
+    local ext_suffix="${2:-so}"
+    local lib_suffix="${3:-so}"
+
+    echo "Optimizing size..."
+
+    # Generic cleanup
+    find "$sp_dir" -type d -name __pycache__ -exec rm -rf {} + 2>/dev/null || true
+    find "$sp_dir" -type d -name tests -exec rm -rf {} + 2>/dev/null || true
+    find "$sp_dir" -type d -name "*.dist-info" -exec rm -rf {} + 2>/dev/null || true
+    find "$sp_dir" -name "*.pyi" -delete 2>/dev/null || true
+    rm -rf "$sp_dir"/{pip,setuptools,pkg_resources,_distutils_hack}* 2>/dev/null || true
+
+    # Trim numpy if present
+    for mod in polynomial linalg ma lib distutils f2py typing _pyinstaller; do
+        rm -rf "$sp_dir/numpy/$mod" 2>/dev/null || true
+    done
+
+    # Trim OpenCV if present
+    rm -f "$sp_dir"/cv2/opencv_videoio_ffmpeg*."$lib_suffix" 2>/dev/null || true
+    rm -rf "$sp_dir"/cv2/{data,gapi,misc,utils,typing_stubs,typing} 2>/dev/null || true
+
+    # Trim Pillow unused plugins if present
+    rm -rf "$sp_dir"/PIL/{FpxImagePlugin,MicImagePlugin,McIdasImagePlugin}* 2>/dev/null || true
+
+    # Trim zeroconf service DB if present
+    rm -rf "$sp_dir"/zeroconf/_services 2>/dev/null || true
+
+    # Strip debug symbols from native extensions
+    find "$sp_dir" -name "*.$ext_suffix" -exec strip --strip-debug {} \; 2>/dev/null || true
+
+    # Remove .py source files (keep .pyc only) — saves ~30-40% on pure-Python packages
+    find "$sp_dir" -name "*.py" ! -name "__init__.py" -delete 2>/dev/null || true
+}