feat(agent): add anonymous trial and error diagnosis

[IRONICBo]

Summary

• allow one anonymous hosted-model task per device, then guide the user to sign in for credits or configure an API key
• keep the trial credential separate from account credentials and pin the correct identity for each task turn and settlement
• keep the managed-task limit local: up to three authenticated tasks, while only one anonymous trial task may be active
• preserve the per-session Xiaohongshu login gate and avoid opening or checking a second shared page
• add client-side sanitized diagnosis and localized rendering for otherwise unknown errors
• rebase onto the current main managed-background-task implementation

Server

• https://github.com/socai-io/socai-server/pull/28

Contract notes

• no /v1/llm/tasks/{task_id}/acquire endpoint is introduced
• a login during an in-flight trial does not break that task; the next reply rebinds to the current signed-in identity
• restart recovery may settle the original anonymous task idempotently, but cannot start another anonymous model call

Validation

• npm_config_registry=https://registry.npmjs.org pnpm run build
• cargo test -p socai-core --lib — 99 passed, 0 failed, 2 ignored
• cargo check -p socai_app -p socai-cli
• git diff --check
• final automated review: no blocking findings

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Project	Deployment	Actions	Updated (UTC)
socai-site	Ignored	Preview	Aug 30, 2026 9:10am

[IRONICBo]

Closing per maintainer request to keep the active delivery queue focused on four PRs only: audio/video integration, Douyin, TikTok, and the consolidated browser self-healing PR #292. This PR remains available in history and can be restored separately if needed.