feat: add OpenAPI TypeScript client generation setup

Add openapi-typescript devDependency and npm scripts for generating
typed TypeScript schema from the FastAPI OpenAPI spec. Include a
static openapi.json snapshot for offline generation.

- npm run generate: fetch schema from running backend and generate types
- npm run generate:local: generate types from the bundled openapi.json

Closes leeworks-agents/SPARC#26

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/package.json

@@ -7,6 +7,8 @@
     "dev": "vite",
     "build": "tsc -b && vite build",
     "lint": "eslint .",
+    "generate": "openapi-typescript http://localhost:8000/api/openapi.json -o src/api/schema.d.ts",
+    "generate:local": "openapi-typescript src/api/openapi.json -o src/api/schema.d.ts",
     "preview": "vite preview"
   },
   "dependencies": {
@@ -30,6 +32,7 @@
     "globals": "^15.8.0",
     "postcss": "^8.4.39",
     "tailwindcss": "^3.4.4",
+    "openapi-typescript": "^7.0.0",
     "typescript": "~5.5.3",
     "typescript-eslint": "^8.0.0",
     "vite": "^5.3.3"