Add uptime monitor features: fix history bars, lifetime stats, detail modal, custom services

- Fix 24-bar history rendering to always show 24 uniform segments with gray fill for missing hours
- Add lifetime uptime % and avg latency to status API
- Add clickable detail modal with expanded stats, large history bar, and service removal
- Add monitored_services DB table with CRUD API (GET/POST/DELETE)
- Monitor reads services from DB each interval, seeds defaults on first run
- Add inline form to add custom services to track
- Extend log retention from 7 days to 90 days for lifetime stats

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/api/status/route.ts

@@ -34,6 +34,26 @@ export async function GET() {
       GROUP BY service_name
     `);
 
+        // Get lifetime stats (all available data)
+        const statsLifetime = await db.all(`
+      SELECT service_name,
+             count(*) as total,
+             sum(case when status = 'up' then 1 else 0 end) as up_count
+      FROM uptime_logs
+      GROUP BY service_name
+    `);
+
+        // Get average latency over last 24h (only for 'up' checks)
+        const avgLatencyRows = await db.all(`
+      SELECT service_name,
+             ROUND(AVG(latency)) as avg_latency
+      FROM uptime_logs
+      WHERE timestamp > datetime('now', '-24 hours')
+        AND status = 'up'
+        AND latency > 0
+      GROUP BY service_name
+    `);
+
         // Get hourly history for last 24h (24 buckets per service)
         const history = await db.all(`
       SELECT service_name,
@@ -60,11 +80,15 @@ export async function GET() {
         const results = live.map(l => {
             const s24 = stats24h.find(s => s.service_name === l.name);
             const s7d = stats7d.find(s => s.service_name === l.name);
+            const sLife = statsLifetime.find(s => s.service_name === l.name);
+            const avgLat = avgLatencyRows.find(s => s.service_name === l.name);
 
             return {
                 ...l,
                 uptime24h: s24 ? Math.round((s24.up_count / s24.total) * 100) : 100,
                 uptime7d: s7d ? Math.round((s7d.up_count / s7d.total) * 100) : 100,
+                uptimeLifetime: sLife ? Math.round((sLife.up_count / sLife.total) * 100) : 100,
+                avgLatency24h: avgLat ? avgLat.avg_latency : 0,
                 history: historyMap[l.name] || [],
             };
         });