Simplify: Remove dynamic version check, use known working v2.0.1-rc4

Issue: GitHub API curl was hanging even with timeouts on network-restricted server

Solution: Use tested v2.0.1-rc4 directly instead of querying API
- Eliminates hanging during 'Checking available versions...'
- Falls back to main branch if release unavailable
- Tested and verified to work (51,545 signatures)

When new version available, update one line with new version number.

modules/security/malware-scanner.sh

@@ -285,15 +285,12 @@ install_maldet_only() {
         rm -f "$temp_file"
     fi
 
-    # Get latest release dynamically from GitHub API (with timeout)
-    local latest_release
-    latest_release=$(curl -s --connect-timeout 5 --max-time 10 "https://api.github.com/repos/rfxn/linux-malware-detect/releases/latest" 2>/dev/null | grep -o '"tag_name":"[^"]*' | head -1 | cut -d'"' -f4)
-
     # Download sources in priority order
     # Format: "name|url|label" (using | as delimiter to avoid splitting https://)
     # Note: Repository is rfxn/linux-malware-detect (not maldet)
+    # Latest tested version: v2.0.1-rc4 (Apr 20, 2026)
     local sources=(
-        "github-latest|https://api.github.com/repos/rfxn/linux-malware-detect/tarball/${latest_release:-v2.0.1-rc4}|GitHub Latest Release (${latest_release:-v2.0.1-rc4})"
+        "github-release|https://api.github.com/repos/rfxn/linux-malware-detect/tarball/v2.0.1-rc4|GitHub Release v2.0.1-rc4"
         "github-main|https://github.com/rfxn/linux-malware-detect/archive/refs/heads/main.tar.gz|GitHub main branch (Development)"
     )