feat: Error handling middleware

feat: Ability to get the db variable from everywhere with getDatabase function
feat: Hello world when getting root url
fix: Now mods model is able to communicate with db
fix: fixed a syntax error in routes/mods.js file which caused sending two responses to the client

package.json

@@ -5,6 +5,7 @@
   "main": "server.js",
   "scripts": {
     "start": "node server.js",
+    "start-auto": "pnpx nodemon server.js",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "keywords": [],
@@ -12,7 +13,7 @@
   "license": "ISC",
   "packageManager": "pnpm@10.5.2",
   "dependencies": {
-    "better-sqlite3": "^11.8.1",
+    "better-sqlite3": "^11.9.1",
     "express": "^4.21.2",
     "mysql": "^2.18.1"
   },
@@ -20,5 +21,8 @@
     "onlyBuiltDependencies": [
       "better-sqlite3"
     ]
+  },
+  "devDependencies": {
+    "nodemon": "^3.1.9"
   }
 }