Renames VITE_AUTH_* to VITE_OIDC_* to match the stack convention.
Adds a dedicated VITE_OIDC_POST_LOGOUT_REDIRECT_URI instead of deriving
it from the redirect URI via string replace. Switches from Dockerfile
ARG/ENV to a committed src/Budget.Client/.env so Vite picks up
production values at build time without needing build-arg overrides.
.env.local is gitignored for localhost dev overrides.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Authority, Audience, and MetadataAddress are not secrets so they belong
in committed config rather than runtime env vars. MetadataAddress points
to the internal Docker URL for JWKS fetch, avoiding nginx hairpinning;
it is blanked in Development so the JWT middleware falls back to
Authority-based discovery. RequireHttpsMetadata is disabled only when
MetadataAddress is set (internal http URL).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>