feat: Add stale process monitor, users route, landing page, archive old scripts

- Add backend stale process monitoring API (/api/stale-processes)
- Add users management route
- Add frontend landing page and stale process monitor UI on /scraper-tools
- Move old development scripts to backend/archive/
- Update frontend build with new features

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

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

backend/archive/check-proxy-stats.js

@@ -0,0 +1,36 @@
+const { Pool } = require('pg');
+
+const pool = new Pool({
+  connectionString: process.env.DATABASE_URL || 'postgresql://kelly:kelly@localhost:5432/hub'
+});
+
+(async () => {
+  try {
+    const stats = await pool.query(`
+      SELECT
+        COUNT(*) as total,
+        COUNT(*) FILTER (WHERE active = true) as active,
+        COUNT(*) FILTER (WHERE active = false) as inactive,
+        COUNT(*) FILTER (WHERE test_result = 'success') as passed,
+        COUNT(*) FILTER (WHERE test_result = 'failed') as failed,
+        COUNT(*) FILTER (WHERE test_result IS NULL) as untested
+      FROM proxies
+    `);
+
+    const s = stats.rows[0];
+    console.log('\n📊 Proxy Statistics:');
+    console.log('='.repeat(60));
+    console.log(`Total Proxies:   ${s.total}`);
+    console.log(`Active:          ${s.active} (passing tests)`);
+    console.log(`Inactive:        ${s.inactive} (failed tests)`);
+    console.log(`Test Results:`);
+    console.log(`  ✅ Passed:     ${s.passed}`);
+    console.log(`  ❌ Failed:     ${s.failed}`);
+    console.log(`  ⚪ Untested:   ${s.untested}`);
+
+    process.exit(0);
+  } catch (error) {
+    console.error('Error:', error);
+    process.exit(1);
+  }
+})();