fix(web): Fix issue with anonymous access

[brendan-kellam]

I removed proxy.ts in #977, which broke some of our existing redirect behaviour. This PR adds back proxy.ts (accounting for OAuth). Ideally, when we remove the requirement of the ~ being in the URL, we'll be able to remove proxy.ts

Fixes #983

Summary by CodeRabbit

• Bug Fixes
  • Fixed an issue where users were not being redirected to the homepage after clicking "continue as guest."

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

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Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 192afa25-5856-4dc9-9f67-fa0c2525db09

📥 Commits

Reviewing files that changed from the base of the PR and between 0504da2 and 07d7315.

📒 Files selected for processing (2)

• CHANGELOG.md
• packages/web/src/proxy.ts

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Walkthrough

Adds a new Next.js middleware (proxy.ts) for domain-based request routing with conditional exemptions for public routes, and documents a bug fix in the changelog for guest access redirection functionality.

Changes

Cohort / File(s)	Summary
Documentation CHANGELOG.md	Added fixed entry documenting correction for guest access redirection behavior.
Proxy Middleware packages/web/src/proxy.ts	New middleware implementation handling domain normalization, public route exemptions (login, signup, oauth, etc.), and conditional URL rewriting/redirects to single-tenant domain; includes matcher config excluding API, static assets, and various public endpoints.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• #970: Modifies the same proxy.ts middleware file with naming and structural changes to the proxy implementation.
• #332: Implements related request-routing and middleware matcher logic for exempting public/static routes in the web package.

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch bkellam/fix-SOU-625

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