feat(api): generate TypeScript API client from OpenAPI specification

Create type-safe TypeScript API client automatically generated from the
OpenAPI specification. Includes generated schema types and documented client
wrapper for type-safe backend communication.

Ref: T008 (specs/001-modbus-relay-control)

package.json

@@ -6,15 +6,18 @@
   "scripts": {
     "dev": "vite",
     "build": "vue-tsc -b && vite build",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "generate:api": "curl -s http://localhost:3100/specs > openapi.yaml && openapi-typescript openapi.yaml -o src/api/schema.ts && rm openapi.yaml"
   },
   "dependencies": {
+    "openapi-fetch": "^0.15.0",
     "vue": "^3.5.24"
   },
   "devDependencies": {
     "@types/node": "^24.10.1",
     "@vitejs/plugin-vue": "^6.0.1",
     "@vue/tsconfig": "^0.8.1",
+    "openapi-typescript": "^7.10.1",
     "typescript": "~5.9.3",
     "vite": "^7.2.4",
     "vue-tsc": "^3.1.4"