feat(install): auto-detect WSL + install Linux system deps for camoufox

The Camoufox browser (Playwright-based) needs ~30 Linux system libraries
to run. On fresh WSL/Ubuntu, these are not pre-installed, causing the
browser daemon to crash silently with only a cryptic 'No such file or
directory' error.

Changes:
1. Add detect_wsl() — reads /proc/version for 'microsoft'/'wsl'
2. Add install_linux_deps() — installs all 30+ Playwright deps via
   apt-get/dnf/yum before installing camoufox-browser
3. Handles t64 package name variants (libasound2t64 vs libasound2)
4. Shows WSL-specific note at end of install
5. npm install -g camoufox-browser + install now run with better output
6. Verifies browser binary exists at ~/.cache/camoufox/ post-install
7. Install now fully automatic on fresh WSL — no manual apt-get needed

install.sh

@@ -37,6 +37,52 @@ detect_os() {
     esac
 }
 
+# ── WSL Detection ──────────────────────────────────────────────────────────
+# Detect if we're running inside Windows Subsystem for Linux.
+# /proc/version contains "microsoft" or "wsl" (case-insensitive) on WSL.
+detect_wsl() {
+    if [ -f /proc/version ] && grep -qiE 'microsoft|wsl' /proc/version 2>/dev/null; then
+        return 0  # true — we are in WSL
+    fi
+    return 1
+}
+
+# ── Linux System Dependencies ──────────────────────────────────────────────
+# Camoufox (Playwright-based) needs ~30 system libraries on Linux/WSL.
+# Without these, the browser daemon crashes silently with
+# "Failed to connect: No such file or directory (os error 2)".
+# See: https://playwright.dev/docs/troubleshooting#system-dependencies
+CAMOUFOX_LINUX_DEPS=(
+    libgtk-3-0
+    libnss3
+    libnspr4
+    libatk1.0-0t64
+    libatk-bridge2.0-0t64
+    libcups2t64
+    libdrm2
+    libxkbcommon0
+    libxcomposite1
+    libxdamage1
+    libxfixes3
+    libxrandr2
+    libgbm1
+    libpango-1.0-0
+    libcairo2
+    libasound2t64
+    libxcb-shm0
+    libx11-xcb1
+    libx11-6
+    libxcb1
+    libxext6
+    libxcursor1
+    libxi6
+    libfreetype6
+    libfontconfig1
+    libxshmfence1
+    libxrender1
+    libdbus-1-3
+)
+
 install_rust_if_needed() {
     if ! command -v cargo &>/dev/null; then
         info "Rust toolchain not found. Installing..."
@@ -60,13 +106,105 @@ install_node_if_needed() {
     fi
 }
 
+# ── Linux System Deps Installer ────────────────────────────────────────────
+install_linux_deps() {
+    if [ "$(uname -s)" != "Linux" ]; then
+        return 0  # Not Linux, skip
+    fi
+
+    # Check if we're in WSL (Windows Subsystem for Linux)
+    if detect_wsl; then
+        info "WSL detected. Checking Linux system dependencies..."
+    fi
+
+    # Check which packages are already installed
+    local missing=()
+    if command -v dpkg-query &>/dev/null; then
+        for pkg in "${CAMOUFOX_LINUX_DEPS[@]}"; do
+            if ! dpkg-query -W -f='${Status}' "$pkg" 2>/dev/null | grep -q "install ok installed"; then
+                # Handle libasound2 vs libasound2t64 and similar t64 variants
+                # Try without 't64' suffix as fallback
+                local alt_pkg="${pkg%t64}"
+                if [ "$alt_pkg" != "$pkg" ] && dpkg-query -W -f='${Status}' "$alt_pkg" 2>/dev/null | grep -q "install ok installed"; then
+                    continue  # alt version is already installed
+                fi
+                missing+=("$pkg")
+            fi
+        done
+    else
+        # Can't check, just try to install all
+        missing=("${CAMOUFOX_LINUX_DEPS[@]}")
+    fi
+
+    if [ ${#missing[@]} -eq 0 ]; then
+        info "All Linux system dependencies already installed"
+        return 0
+    fi
+
+    info "Installing ${#missing[@]} missing Linux system dependencies..."
+    if command -v apt-get &>/dev/null; then
+        if command -v sudo &>/dev/null; then
+            sudo apt-get update -qq 2>/dev/null || true
+            sudo apt-get install -y -qq "${missing[@]}" 2>/dev/null || {
+                # If some packages failed, retry with auto-detected alternatives
+                warn "Some packages had issues. Retrying with apt --fix..."
+                sudo apt-get --fix-broken install -y -qq 2>/dev/null || true
+                # Try installing without t64 variants as fallback
+                local fallback=()
+                for pkg in "${missing[@]}"; do
+                    local alt="${pkg%t64}"
+                    if [ "$alt" != "$pkg" ]; then
+                        fallback+=("$alt")
+                    fi
+                done
+                if [ ${#fallback[@]} -gt 0 ]; then
+                    sudo apt-get install -y -qq "${fallback[@]}" 2>/dev/null || true
+                fi
+            }
+        else
+            apt-get update -qq 2>/dev/null || true
+            apt-get install -y -qq "${missing[@]}" 2>/dev/null || true
+        fi
+        ok "Linux system dependencies installed"
+    elif command -v dnf &>/dev/null; then
+        info "Detected dnf package manager"
+        sudo dnf install -y nss nspr atk at-spi2-atk cups-libs libdrm libXcomposite \
+            libXdamage libXrandr mesa-libgbm pango alsa-lib libxkbcommon libxcb \
+            libX11-xcb libX11 libXext libXcursor libXfixes libXi gtk3 cairo-gobject 2>/dev/null || true
+        ok "Linux system dependencies installed"
+    elif command -v yum &>/dev/null; then
+        info "Detected yum package manager"
+        sudo yum install -y nss nspr atk at-spi2-atk cups-libs libdrm libXcomposite \
+            libXdamage libXrandr mesa-libgbm pango alsa-lib libxkbcommon 2>/dev/null || true
+        ok "Linux system dependencies installed"
+    else
+        warn "No supported package manager (apt-get/dnf/yum). You may need to install system dependencies manually."
+        warn "Required packages: ${CAMOUFOX_LINUX_DEPS[*]}"
+    fi
+}
+
 install_camofox_browser() {
     info "Installing camofox-browser (anti-detection browser)..."
-    if command -v npx &>/dev/null; then
-        info "Installing via npm..."
-        npm install -g camoufox-browser 2>&1 | tail -5
+
+    # Step 1: Install Linux system dependencies (needed by Playwright/Camoufox)
+    install_linux_deps
+
+    # Step 2: Install the npm package
+    if command -v npx &>/dev/null || command -v npm &>/dev/null; then
+        info "Installing npm package..."
+        npm install -g camoufox-browser 2>&1 | tail -3
+
+        info "Downloading Camoufox browser binary (this may take a while, ~662MB)..."
         npx camoufox-browser@latest install 2>&1 | tail -5
-        ok "Camoufox browser installed (npx camoufox-browser start)"
+
+        # Verify the browser binary was actually downloaded
+        if ls ~/.cache/camoufox/camoufox 2>/dev/null; then
+            ok "Camoufox browser binary downloaded (~/.cache/camoufox/)"
+        else
+            warn "Browser binary not found at ~/.cache/camoufox/. May need manual 'npx camoufox-browser@latest install'"
+        fi
+
+        ok "Camoufox browser npm package installed"
     elif command -v docker &>/dev/null; then
         info "Installing via Docker..."
         docker run -d --name camoufox -p 9377:9377 \
@@ -146,6 +284,12 @@ print_post_install() {
     echo "  gyandoot service status    Check service status"
     echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
     echo ""
+
+    if detect_wsl; then
+        echo "  ⚠️  WSL detected — Node.js must be installed INSIDE WSL."
+        echo "     (The Windows-side Node.js is not accessible from WSL.)"
+        echo ""
+    fi
 }
 
 prompt_service_install() {
@@ -167,6 +311,9 @@ main() {
     os=$(detect_os)
     arch=$(detect_architecture)
     info "Detected: $os / $arch"
+    if detect_wsl; then
+        info "WSL (Windows Subsystem for Linux) detected — will install Linux dependencies"
+    fi
 
     install_rust_if_needed
     install_node_if_needed