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>

.eslintrc.json

@@ -0,0 +1,32 @@
+{
+  "extends": [
+    "next/core-web-vitals",
+    "prettier",
+    "plugin:react-hooks/recommended"
+  ],
+  "plugins": ["prettier"],
+  "rules": {
+    "import/no-cycle": ["error", { "maxDepth": 1 }],
+    "import/order": [
+      "error",
+      {
+        "newlines-between": "always"
+      }
+    ],
+    "no-else-return": ["error", { "allowElseIf": true }]
+  },
+  "settings": {
+    "import/resolver": {
+      "node": {
+        "paths": ["src"]
+      }
+    }
+  },
+  "parserOptions": {
+    "ecmaVersion": 6,
+    "sourceType": "module",
+    "ecmaFeatures": {
+      "modules": true
+    }
+  }
+}