🔧 [#244] chore: Add pre-commit path linting

```
npx ast-grep scan --interactive
```

or

```
npx ast-grep scan --update-all
```

or see:
https://ast-grep.github.io/guide/project/severity.html#ignore-linting-error

Author: CharString

frontend/package-lock.json

@@ -27,6 +27,7 @@
     "react-router": "^7.5.0"
   },
   "devDependencies": {
+    "@ast-grep/cli": "^0.39.6",
     "@chromatic-com/storybook": "^3.2.6",
     "@commitlint/cli": "^19.8.0",
     "@commitlint/config-conventional": "^19.8.0",
@@ -64,7 +65,7 @@
     "vitest": "^3.1.3"
   },
   "lint-staged": {
-    "*.{js,ts,md}": "npm run lint:fix"
+    "*.{js,ts,md}": ["npm run lint:fix", "npx ast-grep scan"]
   },
   "msw": {
     "workerDirectory": [

frontend/package.json

@@ -0,0 +1,18 @@
+id: force-py-endpoint-trailing-slash
+language: python
+rule:
+  pattern: $PATH
+  kind: string
+  regex: '".+[^/]"'
+  inside:
+    kind: argument_list
+    inside:
+      kind: call
+      pattern: path($$$)
+transform:
+  NEW_PATH:
+    replace:
+      source: $PATH
+      replace: "[^/]$"
+      by: '$1/"'
+fix: $NEW_PATH

frontend/rules/py-endpoint.yaml

@@ -0,0 +1,26 @@
+id: ts-force-endpoint-trailing-slash
+language: TypeScript
+rule:
+  pattern: $ENDPOINT
+  any:
+    - kind: template_string
+    - kind: string
+  regex: '[^/]["`]'
+  follows:
+    kind: string
+    regex: (DELETE|GET|PATCH|POST|PUT)
+    stopBy: end
+  inside:
+    any:
+      - kind: array
+        inside:
+          kind: arguments
+      - kind: arguments
+severity: error
+transform:
+  NEW_ENDPOINT:
+    replace:
+      source: $ENDPOINT
+      replace: '(["`])$'
+      by: "/$1"
+fix: $NEW_ENDPOINT

frontend/rules/ts-endpoint.yaml

@@ -0,0 +1,2 @@
+ruleDirs:
+  - ./rules