Finish axios migration via shared native HTTP helper

Replace all in-scope axios callsites with a new helpers/http.js wrapper over native fetch, including JSON/text GET, JSON POST, HEAD checks, and transient 5xx retry behavior; update all browser, build, script, and proxy API clients to use it; add focused unit tests; and remove axios from package dependencies.

Constraint: Preserve API/build and deployment behavior while lowering transport surface area.

Rejected: inline fetch replacements at each callsite | rejected to avoid inconsistent error/retry semantics.

Confidence: high

Scope-risk: moderate

Directive: Keep helper in place as the transport boundary and update tests when changing request semantics.

Tested: pnpm run -s typecheck, pnpm -s run test-prebuild, pnpm -s run test, pnpm -s run test:browser, pnpm -s run netlify-build, smoke GETs on /apple-silicon-app-test and /apple-silicon-app-test/?version=2

Not-tested: branch/netlify deployment health in CI pipeline after merge

scripts/scan-new-apps.js

@@ -1,8 +1,8 @@
 import { createServer } from 'vite'
-import axios from 'axios'
 
 import viteConfig from '~/vite.config.mjs'
 import { isLinux } from '~/helpers/environment.js'
+import { getText } from '~/helpers/http.js'
 
 const port = 1337
 
@@ -29,12 +29,12 @@ const runScans = false
 
     console.log(`Server listening on https://${ vercelUrl }:${ port }/`)
 
-    const { data } = await axios.get(`http://${ vercelUrl }:${ port }/`)
+    const data = await getText( `http://${ vercelUrl }:${ port }/` )
         .catch( err => {
             console.log( 'err', err )
         })
 
-    console.log( data.slice(0, 100) )
+    console.log( data?.slice(0, 100) )
 
     await server.close();