feat: feature voting (PCL-style), poll owner edit/delete, blind polls for all

backend/db.js

@@ -200,6 +200,23 @@ async function initSchema(connection) {
     INDEX idx_poll (poll_id)
   ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4`);
 
+  await createIfNotExists('feature_items', `CREATE TABLE feature_items (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    title VARCHAR(200) NOT NULL,
+    description TEXT,
+    status ENUM('pending','planned','done') NOT NULL DEFAULT 'pending',
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
+  ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4`);
+
+  await createIfNotExists('feature_votes', `CREATE TABLE 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`);
+
   await createIfNotExists('audit_logs', `CREATE TABLE audit_logs (
     id INT AUTO_INCREMENT PRIMARY KEY,
     user_id INT,