feat: add custom-jwt and api-key auth modes#43
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Add two new authentication modes for the universal LangGraph frontend: - custom-jwt: External IdP authentication with PKCE + OIDC Authorization Code Flow, JWKS-based token validation, and CSRF state parameter - api-key: LangGraph Cloud API key authentication with input form and server-side validation via /assistants/search endpoint Refactor binary auth predicates (requiresNextAuth/allowsAnonymousAccess) into fine-grained predicates (usesNextAuth/requiresLoginUI/requiresUserIdentity) with backward-compatible aliases. Migrate 15+ callsites across middleware, proxy route, auth handlers, and layout files. Includes server examples, auth architecture docs, setup guide for Keycloak/Auth0/Supabase, and E2E tests for all new modes.
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Summary
custom-jwtauth mode: external IdP authentication with PKCE + OIDC Authorization Code Flow, JWKS-based server-side validation, CSRF state parameter protectionapi-keyauth mode: LangGraph Cloud API key authentication with input form UI and server-side validation via/assistants/searchendpointrequiresNextAuth/allowsAnonymousAccess) into fine-grained predicates (usesNextAuth/requiresLoginUI/requiresUserIdentity) with backward-compatible deprecated aliases/api/[..._path]) auth-mode-aware: forwards JWT Bearer for NextAuth/custom-jwt modes,x-api-keyfor api-key mode/api/auth/validate-api-keyendpointexamples/custom-jwt/(PyJWKClient JWKS validation) andexamples/api-key/(LangGraph Cloud native)