Add one-line install script and simplify README installation section

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

install.sh

@@ -0,0 +1,48 @@
+#!/bin/sh
+set -e
+
+REPO="https://gitea.jaidaken.dev/jaidaken/ferrosonic.git"
+INSTALL_DIR="/usr/local/bin"
+
+echo "Ferrosonic installer"
+echo "===================="
+
+# Detect package manager and install dependencies
+if command -v pacman >/dev/null 2>&1; then
+    echo "Detected Arch Linux"
+    sudo pacman -S --needed --noconfirm mpv pipewire wireplumber base-devel pkgconf dbus
+elif command -v dnf >/dev/null 2>&1; then
+    echo "Detected Fedora"
+    sudo dnf install -y mpv pipewire wireplumber gcc pkgconf-pkg-config dbus-devel
+elif command -v apt >/dev/null 2>&1; then
+    echo "Detected Debian/Ubuntu"
+    sudo apt update
+    sudo apt install -y mpv pipewire wireplumber build-essential pkg-config libdbus-1-dev
+else
+    echo "Unknown package manager. Please install manually: mpv, pipewire, wireplumber, pkg-config, dbus dev headers"
+    echo "Then re-run this script."
+    exit 1
+fi
+
+# Install Rust if not present
+if ! command -v cargo >/dev/null 2>&1; then
+    echo "Installing Rust toolchain..."
+    curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+    . "$HOME/.cargo/env"
+fi
+
+# Clone and build
+TMPDIR=$(mktemp -d)
+echo "Building ferrosonic..."
+git clone "$REPO" "$TMPDIR/ferrosonic"
+cd "$TMPDIR/ferrosonic"
+cargo build --release
+
+# Install
+sudo cp target/release/ferrosonic "$INSTALL_DIR/ferrosonic"
+echo ""
+echo "Ferrosonic installed to $INSTALL_DIR/ferrosonic"
+echo "Run 'ferrosonic' to start."
+
+# Cleanup
+rm -rf "$TMPDIR"