feat: 新增打字练习记录与首页记录列表

server/db.py

@@ -51,6 +51,23 @@ CREATE TABLE IF NOT EXISTS settings (
   extra_config TEXT NOT NULL DEFAULT '{}',
   updated_at TEXT NOT NULL
 );
+
+CREATE TABLE IF NOT EXISTS typing_logs (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+  mode TEXT NOT NULL,
+  category_id TEXT NOT NULL DEFAULT '',
+  category_name TEXT NOT NULL DEFAULT '',
+  item_count INTEGER NOT NULL DEFAULT 0,
+  correct_keys INTEGER NOT NULL DEFAULT 0,
+  error_keys INTEGER NOT NULL DEFAULT 0,
+  accuracy INTEGER NOT NULL DEFAULT 0,
+  duration_seconds INTEGER NOT NULL DEFAULT 0,
+  created_at TEXT NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_typing_logs_user_created
+ON typing_logs(user_id, created_at);
 """