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/create-table.js

@@ -0,0 +1,38 @@
+const { Pool } = require('pg');
+
+const pool = new Pool({
+  connectionString: process.env.DATABASE_URL
+});
+
+(async () => {
+  try {
+    await pool.query(`
+      CREATE TABLE IF NOT EXISTS proxy_test_jobs (
+        id SERIAL PRIMARY KEY,
+        status VARCHAR(20) NOT NULL DEFAULT 'pending',
+        total_proxies INTEGER NOT NULL DEFAULT 0,
+        tested_proxies INTEGER NOT NULL DEFAULT 0,
+        passed_proxies INTEGER NOT NULL DEFAULT 0,
+        failed_proxies INTEGER NOT NULL DEFAULT 0,
+        started_at TIMESTAMP,
+        completed_at TIMESTAMP,
+        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+      );
+    `);
+    
+    await pool.query(`
+      CREATE INDEX IF NOT EXISTS idx_proxy_test_jobs_status ON proxy_test_jobs(status);
+    `);
+    
+    await pool.query(`
+      CREATE INDEX IF NOT EXISTS idx_proxy_test_jobs_created_at ON proxy_test_jobs(created_at DESC);
+    `);
+    
+    console.log('✅ Table created successfully');
+    process.exit(0);
+  } catch (error) {
+    console.error('❌ Error:', error);
+    process.exit(1);
+  }
+})();