fix: grep nginx logs directly in /logs/:ip endpoint

Records now works without running a scan first. If logs aren't cached in memory from a scan, the endpoint greps the nginx access logs directly for [Client IP] matches and returns the last 500 lines.

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

dashboard/server.js

@@ -490,12 +490,29 @@ app.get('/api/f2b/poll', (req, res) => {
 });
 
 // ── Routes: Nginx log viewer ──────────────────────────────────────────────────
-app.get('/logs/:ip', (req, res) => {
+app.get('/logs/:ip', async (req, res) => {
   const ip   = req.params.ip;
-  const logs = ipLogs.get(ip) || [];
   const hist = banHistory.get(ip);
   const esc  = s => String(s).replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
 
+  let logs = ipLogs.get(ip) || [];
+
+  // If no logs in memory, grep nginx logs directly
+  if (logs.length === 0) {
+    try {
+      const files = fs.readdirSync(LOG_DIR)
+        .filter(f => f.startsWith('proxy-host-') && f.endsWith('_access.log'))
+        .map(f => path.join(LOG_DIR, f));
+
+      const ipEscaped = ip.replace(/\./g, '\\.');
+      const grepCmd = `grep -h "\\[Client ${ipEscaped}\\]" ${files.join(' ')} 2>/dev/null || true`;
+      const output = await run(grepCmd);
+      logs = output.trim().split('\n').filter(l => l.trim()).slice(-500); // last 500 lines
+    } catch (e) {
+      logs = [`[Error reading logs: ${e.message}]`];
+    }
+  }
+
   let badge = '';
   if (hist) badge = `<div class="hi" style="margin:.5rem 0">&#9888; Previously banned ${hist.banCount}x &mdash; last ${new Date(hist.lastSeen).toLocaleString()}</div>`;
 
@@ -508,8 +525,8 @@ app.get('/logs/:ip', (req, res) => {
 <div class="box">
   <div class="box-title">// LOG ENTRIES</div>
   ${badge}
-  <p class="muted">Entries in current scan window: ${logs.length}</p>
+  <p class="muted">Entries found: ${logs.length}</p>
-  <pre>${logs.map(esc).join('\n') || '(no entries — run a scan first)'}</pre>
+  <pre>${logs.map(esc).join('\n') || '(no entries found)'}</pre>
 </div>
 <div class="prompt">_ <span class="blink">&#9608;</span></div>
 <footer>F2B Control Center | :${process.env.PORT || 4000}</footer>