fix: migrate new tables on every startup, not just fresh install

backend/db.js

@@ -44,6 +44,7 @@ async function getPool() {
       charset: 'utf8mb4',
       timezone: '+08:00',
     });
+    await migrateAdditions(pool);
   }
   return pool;
 }
@@ -261,6 +262,13 @@ async function migrateAdditions(db) {
   try { await db.execute("ALTER TABLE tickets ADD COLUMN parent_ticket_id INT"); } catch {}
   try { await db.execute("ALTER TABLE tickets MODIFY type ENUM('report','suggestion','appeal','result_appeal') NOT NULL"); } catch {}
   try { await db.execute("ALTER TABLE tickets MODIFY status ENUM('pending','processing','awaiting_info','appealing','resolved','rejected','closed') NOT NULL"); } catch {}
+
+  try { await db.execute(`CREATE TABLE IF NOT EXISTS polls (id INT AUTO_INCREMENT PRIMARY KEY, title VARCHAR(200) NOT NULL, description TEXT, options JSON NOT NULL, group_name VARCHAR(100) NOT NULL DEFAULT '', server_name VARCHAR(100) NOT NULL DEFAULT '', start_time DATETIME, end_time DATETIME, active TINYINT(1) NOT NULL DEFAULT 1, created_by INT, created_at DATETIME DEFAULT CURRENT_TIMESTAMP, INDEX idx_active (active), INDEX idx_group_server (group_name, server_name)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4`); } catch {}
+  try { await db.execute(`CREATE TABLE IF NOT EXISTS poll_votes (id INT AUTO_INCREMENT PRIMARY KEY, poll_id INT NOT NULL, user_id INT NOT NULL, option_index INT NOT NULL, created_at DATETIME DEFAULT CURRENT_TIMESTAMP, UNIQUE KEY uk_poll_user (poll_id, user_id), INDEX idx_poll (poll_id)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4`); } catch {}
+  try { await db.execute(`CREATE TABLE IF NOT EXISTS feature_items (id INT AUTO_INCREMENT PRIMARY KEY, title VARCHAR(200) NOT NULL, description TEXT, group_name VARCHAR(100) NOT NULL DEFAULT '', server_name VARCHAR(100) NOT NULL DEFAULT '', status ENUM('pending','planned','done') NOT NULL DEFAULT 'pending', created_at DATETIME DEFAULT CURRENT_TIMESTAMP) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4`); } catch {}
+  try { await db.execute(`CREATE TABLE IF NOT EXISTS feature_votes (id INT AUTO_INCREMENT PRIMARY KEY, item_id INT NOT NULL, user_id INT NOT NULL, created_at DATETIME DEFAULT CURRENT_TIMESTAMP, UNIQUE KEY uk_item_user (item_id, user_id), INDEX idx_item (item_id)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4`); } catch {}
+  try { await db.execute(`CREATE TABLE IF NOT EXISTS feature_comments (id INT AUTO_INCREMENT PRIMARY KEY, item_id INT NOT NULL, user_id INT NOT NULL, content TEXT NOT NULL, created_at DATETIME DEFAULT CURRENT_TIMESTAMP, INDEX idx_item (item_id)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4`); } catch {}
+  try { await db.execute(`CREATE TABLE IF NOT EXISTS server_groups (id INT AUTO_INCREMENT PRIMARY KEY, group_name VARCHAR(100) NOT NULL, server_name VARCHAR(100) NOT NULL, UNIQUE KEY uk_group_server (group_name, server_name)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4`); } catch {}
 }
 
 async function seedTemplates(db) {