Refactor: remove AGPL imgly dependency and migrate background removal to python backend

package.json

@@ -22,7 +22,6 @@
     "@dnd-kit/core": "^6.3.1",
     "@dnd-kit/utilities": "^3.2.2",
     "@google/genai": "^2.4.0",
-    "puppeteer-core": "^24.9.0",
     "@tailwindcss/vite": "^4.1.14",
     "@vitejs/plugin-react": "^5.0.4",
     "dotenv": "^17.2.3",
@@ -34,6 +33,7 @@
     "motion": "^12.23.24",
     "multer": "^2.1.1",
     "papaparse": "^5.5.3",
+    "puppeteer-core": "^24.9.0",
     "react": "^19.0.1",
     "react-dom": "^19.0.1",
     "vite": "^6.2.3"
@@ -52,7 +52,7 @@
     "electron-vite": "^5.0.0",
     "esbuild": "^0.25.0",
     "tailwindcss": "^4.1.14",
-    "tsx": "^4.21.0",
+    "tsx": "^4.22.4",
     "typescript": "~5.8.2",
     "vite": "^6.2.3"
   }