fix: restrict API routes to localhost-only access#25
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All /api/* routes were completely unauthenticated. Add middleware that checks Host and Origin headers to ensure requests originate from localhost only. Blocks CSRF attacks and remote access to credentials and publishing endpoints. Closes #24
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Summary
src/middleware.tsto enforce localhost-only access on all/api/*routesHostheader to block non-localhost network accessOriginheader when present to block CSRF from external originsCloses #24
Test plan
pnpm lintpassescurl -H "Host: evil.com" http://localhost:3000/api/settingsreturns 403curl http://127.0.0.1:3000/api/settingsreturns 200curl -H "Origin: https://evil.com" http://localhost:3000/api/settingsreturns 403