Canvas: Enable ESLint

Change-Id: Ia9e84976b6d237f34c773eb55054fe244c625624
diff --git a/apps/canvas/back/package.json b/apps/canvas/back/package.json
index 803c941..4de4561 100644
--- a/apps/canvas/back/package.json
+++ b/apps/canvas/back/package.json
@@ -3,10 +3,12 @@
   "version": "1.0.0",
   "description": "",
   "main": "index.js",
+  "type": "module",
   "scripts": {
     "build": "tsc",
     "format": "prettier --write src/**/*.{js,ts,jsx,tsx}",
     "format-check": "prettier --check src/**/*.{js,ts,jsx,tsx}",
+    "lint": "eslint .",
     "start": "node dist/index.js"
   },
   "author": "",
@@ -19,12 +21,15 @@
     "zod": "^3.24.4"
   },
   "devDependencies": {
+    "@eslint/js": "^9.13.0",
     "@types/express": "^5.0.0",
     "@types/node": "^22.9.1",
     "@types/sqlite3": "^3.1.11",
+    "eslint": "^9.13.0",
     "prettier": "3.5.3",
     "prisma": "^6.6.0",
-    "typescript": "^5.6.3"
+    "typescript": "^5.6.3",
+    "typescript-eslint": "^8.11.0"
   },
   "prettier": {
     "printWidth": 120,