Add server status monitoring endpoint

- Add status.service.js with CPU, RAM, Disk, Backend stats
- RAM calculation matches htop (reads /proc/meminfo)
- Includes uploads folder size, DB table count
- Returns both system and backend (process) uptime

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/services/status.service.js

@@ -0,0 +1,186 @@
+import os from 'os';
+import path from 'path';
+import { execSync } from 'child_process';
+import { pool } from '../config/database.js';
+
+/**
+ * Get CPU usage percentage
+ */
+const getCpuUsage = () => {
+  const cpus = os.cpus();
+  let totalIdle = 0;
+  let totalTick = 0;
+
+  cpus.forEach((cpu) => {
+    for (const type in cpu.times) {
+      totalTick += cpu.times[type];
+    }
+    totalIdle += cpu.times.idle;
+  });
+
+  const idle = totalIdle / cpus.length;
+  const total = totalTick / cpus.length;
+  const percent = Math.round(((total - idle) / total) * 100);
+
+  return { percent };
+};
+
+/**
+ * Get memory usage (Linux - reads /proc/meminfo for accurate values)
+ */
+const getMemoryUsage = () => {
+  try {
+    // Read /proc/meminfo for accurate memory stats (like htop)
+    const meminfo = execSync('cat /proc/meminfo', { encoding: 'utf8' });
+    const lines = meminfo.split('\n');
+
+    const getValue = (key) => {
+      const line = lines.find(l => l.startsWith(key));
+      if (!line) return 0;
+      const match = line.match(/(\d+)/);
+      return match ? parseInt(match[1]) : 0;
+    };
+
+    const totalKB = getValue('MemTotal');
+    const freeKB = getValue('MemFree');
+    const buffersKB = getValue('Buffers');
+    const cachedKB = getValue('Cached');
+    const sreclaimableKB = getValue('SReclaimable');
+
+    // Available = Free + Buffers + Cached + SReclaimable (like htop calculates)
+    const availableKB = freeKB + buffersKB + cachedKB + sreclaimableKB;
+    const usedKB = totalKB - availableKB;
+
+    // Convert to GB
+    const totalGB = Math.round((totalKB / (1024 ** 2)) * 10) / 10;
+    const usedGB = Math.round((usedKB / (1024 ** 2)) * 10) / 10;
+
+    return {
+      used: usedGB,
+      total: totalGB,
+      unit: 'GB',
+    };
+  } catch {
+    // Fallback to os module
+    const totalBytes = os.totalmem();
+    const freeBytes = os.freemem();
+    const usedBytes = totalBytes - freeBytes;
+
+    return {
+      used: Math.round((usedBytes / (1024 ** 3)) * 10) / 10,
+      total: Math.round((totalBytes / (1024 ** 3)) * 10) / 10,
+      unit: 'GB',
+    };
+  }
+};
+
+/**
+ * Get disk usage (Linux/macOS)
+ */
+const getDiskUsage = () => {
+  try {
+    const output = execSync('df -BG / | tail -1', { encoding: 'utf8' });
+    const parts = output.trim().split(/\s+/);
+
+    const totalGB = parseInt(parts[1]) || 0;
+    const usedGB = parseInt(parts[2]) || 0;
+
+    return {
+      used: usedGB,
+      total: totalGB,
+      unit: 'GB',
+    };
+  } catch {
+    return { used: 0, total: 0, unit: 'GB' };
+  }
+};
+
+/**
+ * Get Node.js backend process stats (CPU + RAM)
+ */
+const getBackendStats = () => {
+  const memUsage = process.memoryUsage();
+
+  // Get CPU usage for this process
+  const cpuUsage = process.cpuUsage();
+  const cpuPercent = Math.round(((cpuUsage.user + cpuUsage.system) / 1000000) * 100) / 100;
+
+  return {
+    memoryMB: Math.round((memUsage.rss / (1024 ** 2)) * 10) / 10,
+    heapMB: Math.round((memUsage.heapUsed / (1024 ** 2)) * 10) / 10,
+    cpuTime: cpuPercent, // CPU time in seconds
+  };
+};
+
+/**
+ * Get uploads directory size
+ */
+const getUploadsSize = () => {
+  try {
+    const uploadsPath = path.join(process.cwd(), 'uploads');
+    const output = execSync(`du -sm "${uploadsPath}" 2>/dev/null || echo "0"`, { encoding: 'utf8' });
+    const sizeMB = parseInt(output.split('\t')[0]) || 0;
+
+    return {
+      sizeMB,
+      unit: 'MB',
+    };
+  } catch {
+    return { sizeMB: 0, unit: 'MB' };
+  }
+};
+
+/**
+ * Get database table count
+ */
+const getTableCount = async () => {
+  try {
+    const result = await pool.query(`
+      SELECT COUNT(*) as count
+      FROM information_schema.tables
+      WHERE table_schema = 'public'
+      AND table_type = 'BASE TABLE'
+    `);
+    return parseInt(result.rows[0]?.count) || 0;
+  } catch {
+    return 0;
+  }
+};
+
+/**
+ * Get system uptime in seconds
+ */
+const getSystemUptime = () => {
+  return Math.floor(os.uptime());
+};
+
+/**
+ * Get Node.js process uptime in seconds
+ */
+const getProcessUptime = () => {
+  return Math.floor(process.uptime());
+};
+
+/**
+ * Get complete server status
+ */
+export const getServerStatus = async () => {
+  const tableCount = await getTableCount();
+
+  return {
+    cpu: getCpuUsage(),
+    memory: getMemoryUsage(),
+    disk: getDiskUsage(),
+    backend: getBackendStats(),
+    uploads: getUploadsSize(),
+    database: {
+      tableCount,
+    },
+    systemUptimeSec: getSystemUptime(),
+    backendUptimeSec: getProcessUptime(),
+    hostname: os.hostname(),
+    platform: os.platform(),
+    nodeVersion: process.version,
+    timestamp: new Date().toISOString(),
+  };
+};