fix: State dropdown and locked platform in schedule modal

- State Code → State dropdown with available states
- Platform field locked to 'dutchie' (read-only)

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

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

backend/src/routes/proxies.ts

@@ -308,6 +308,31 @@ router.get('/retry-stats', async (req, res) => {
   }
 });
 
+// Mark all proxies as active
+router.post('/activate-all', requireRole('superadmin', 'admin'), async (req, res) => {
+  try {
+    const result = await pool.query(`
+      UPDATE proxies
+      SET active = true,
+          failure_count = 0,
+          consecutive_403_count = 0
+      WHERE active = false
+      RETURNING id
+    `);
+
+    const countResult = await pool.query(`SELECT COUNT(*) as total FROM proxies`);
+
+    res.json({
+      message: `Activated ${result.rowCount} proxies`,
+      activated: result.rowCount,
+      total: parseInt(countResult.rows[0].total)
+    });
+  } catch (error) {
+    console.error('Error activating proxies:', error);
+    res.status(500).json({ error: 'Failed to activate proxies' });
+  }
+});
+
 // Manually re-enable proxies that have passed their retry interval
 router.post('/reenable-failed', requireRole('superadmin', 'admin'), async (req, res) => {
   try {