fix: correct imports and add ESLint CI

- Fix proxy.js: use utils/config/service-helpers (correct path for
  Homepage v1.7.0; utils/service-helpers does not exist)
- Fix component.jsx: blank line between external and utils/ imports
  as required by Homepage ESLint import/order rule
- Add .eslintrc.json mirroring Homepage's ESLint config
- Add package.json with ESLint dev dependencies
- Add Forgejo Actions workflow to lint on push/PR

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -0,0 +1,19 @@
+{
+  "name": "homepage-blocky-widget",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "lint": "eslint src/**/*.{js,jsx}"
+  },
+  "devDependencies": {
+    "@next/eslint-plugin-next": "^14.0.0",
+    "eslint": "^8.0.0",
+    "eslint-config-next": "^14.0.0",
+    "eslint-config-prettier": "^9.0.0",
+    "eslint-plugin-import": "^2.29.0",
+    "eslint-plugin-jsx-a11y": "^6.8.0",
+    "eslint-plugin-prettier": "^5.0.0",
+    "eslint-plugin-react": "^7.33.0",
+    "eslint-plugin-react-hooks": "^4.6.0"
+  }
+}