refactor(api): version routes and externalize client base url

- serve REST endpoints under /api/v1 with root exceptions for health and mcp

- move swagger UI to /docs and allow direct frontend calls via CORS

- remove Vite proxy/hash routing and rely on env-driven VITE_API_URL

client/vite.config.ts

@@ -68,15 +68,6 @@ export default defineConfig({
       },
     },
   },
-  server: {
-    proxy: {
-      '/environments': 'http://localhost:13000',
-      '/credentials': 'http://localhost:13000',
-      '/snippets': 'http://localhost:13000',
-      '/sessions': 'http://localhost:13000',
-      '/scenarios': 'http://localhost:13000',
-    },
-  },
   test: {
     projects: [{
       extends: true,