Refactor database schema; add hunts and team_clues tables, update clues structure, and improve error handling in routes

lib/db.js

@@ -4,7 +4,7 @@ let db = null;
 
 export function getDb() {
   if (!db) {
-    db = new sqlite3.Database("./database.sqlite", (err) => {
+    db = new sqlite3.Database("./clue_hunt.db", (err) => {
       if (err) {
         console.error("Error connecting to database:", err);
       } else {