Use WorkOS AuthKit for Pro sign-in

[mrmps]

Replaces Pro’s custom email links with WorkOS AuthKit email-code sign-in. Existing subscriptions, API keys and account quotas remain attached to the same billing account; existing browser sessions require a fresh sign-in.

Configured and verified the production WorkOS environment with live Autumn/Stripe billing: sign-in, existing $20/month Pro access, API key creation, REST/MCP classification, billing portal and session revocation. Setup and migration details are in BILLING.md.

Before (Desktop)	After (Desktop)

Before (Mobile)	After (Mobile)

Preview (Hosted email sign-in)

Production is currently deployed at https://classifier.dev/pro. Merge this PR to retain WorkOS authentication in subsequent main-branch deployments.

[coderabbitai]

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