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Implement 12-factor configuration via environment variables and token-in-cookie authentication for Gitea API access. - internal/config/config.go: reads GITEA_URL, GITEA_TOKEN, LISTEN_ADDR, SESSION_SECRET from environment with validation - internal/auth/cookie.go: HMAC-signed HTTP-only cookie for storing Gitea API tokens (Secure, SameSite=Strict) - internal/middleware/auth.go: extracts token from cookie, injects into request context, redirects unauthenticated users to /settings - internal/middleware/logging.go: structured JSON request logging - internal/handlers/settings.go: settings page for entering/removing Gitea API token with mobile-first dark UI - cmd/server/main.go: integrated config, auth middleware, and settings Includes unit tests for config loading, cookie signing/verification, and auth middleware bypass/redirect logic. Closes leeworks-agents/gitea-mobile#2 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>