Add Waterfall Chart & Request Inspector

Features Added:
- Interactive waterfall timeline visualization
- Color-coded timing bars (DNS, Connect, SSL, TTFB, Download)
- Request filtering by resource type (HTML, JS, CSS, Images, Fonts)
- Detailed request inspector dialog with timing breakdown
- HAR data extraction from Lighthouse results
- Size/compression metrics display
- Third-party resource identification
- Render-blocking resource detection

Technical Implementation:
- Created lib/har-parser.js for network data extraction
- Built waterfall.html with SVG-based timeline renderer
- Added waterfall.js with interactive controls
- Integrated HAR generation into test runner workflow
- Updated main UI with View Waterfall link

remote-debug.ps1

@@ -0,0 +1,25 @@
+$Server = "172.16.69.219"
+$User = "root"
+$Pass = "Q4dv!Z`$nCe#`$OT&h"
+
+function Remote-Exec {
+    param($Cmd)
+    echo "Running: $Cmd"
+    plink -batch -pw "$Pass" "$User@$Server" $Cmd
+}
+
+echo "--- 1. Checking Disk Space ---"
+Remote-Exec "df -h"
+
+echo "--- 2. Checking Node Version ---"
+Remote-Exec "node -v && npm -v"
+
+echo "--- 3. Re-installing Dependencies (Verbose) ---"
+Remote-Exec "cd /var/www/web-page-performance-test && npm install --verbose"
+
+echo "--- 4. Manual Server Start (Crash Test) ---"
+# Run for 5 seconds then kill, or catch crash output
+Remote-Exec "cd /var/www/web-page-performance-test && timeout 5s node server.js || echo 'Crash Detected'"
+
+echo "--- 5. Service Status ---"
+Remote-Exec "systemctl status web-page-performance-test --no-pager"