feat: add video note publishing (post-video)

[murphykobe]

Summary

• Ports the post-video command from upstream jackwener/xiaohongshu-cli#15 — xhs post-video --title ... --body ... --video file.mp4 [--cover cover.jpg] [--topic ...] [--private].
• Threads the per-request uploadAddr from the upload permit response through both image and video upload paths so video publishing also works under XHS_TARGET=rednote (rednote's permit endpoint returns a different upload host per request, which the upstream PR doesn't handle).
• Bundles upstream's "Chinese-content fix": create_image_note and create_video_note now POST via _creator_post (the host the web client actually uses for note creation) and serialize business_binds with ensure_ascii=False.

Why threading uploadAddr matters here

Without it, the upstream PR works on xiaohongshu.com (where UPLOAD_HOST = ros-upload.xiaohongshu.com is a valid CDN endpoint) but breaks on rednote.com because the rednote permit response points uploads at a different host. Now both targets work without target-specific code paths in the upload methods.

Behavioral changes (existing functionality)

• xhs post (image notes) now posts via the creator host (webapi.rednote.com / creator.xiaohongshu.com) rather than the edith host. Upstream verified this is the right host and that posting Chinese titles/bodies stops failing with the switch.
• business_binds JSON is now serialized with ensure_ascii=False (no escaped Unicode in the embedded JSON string).

Refactor

Image and video note creation share a _post_note helper instead of two near-identical 30-line payload builders. Same payload shape as upstream — just deduped.

Test plan

• uv run pytest tests/ — 114 passed, 27 skipped
• XHS_TARGET=rednote uv run pytest tests/ — 114 passed, 27 skipped
• ruff check xhs_cli/ clean
• xhs post-video --help shows expected options
• xhs post-video --video /missing.mp4 → "Video file not found"
• xhs post-video --video foo.txt → "Unsupported video format '.txt'. Supported: .mov, .mp4"
• Live publish on XHS_TARGET=rednote — pending. We have authenticated rednote sessions working from PR feat: support rednote.com via XHS_TARGET env var #1 but no live video upload was run. If the upload returns a 4xx, the most likely culprit is the uploadAddr host — easy to debug with XHS_VERBOSE=1.
• Live publish on default xiaohongshu — pending; upstream confirmed it works for English content.

Files

• xhs_cli/client_mixins.py — adds get_video_upload_permit, upload_video, create_video_note; folds create_image_note and create_video_note into _post_note; get_upload_permit returns uploadAddr; upload_file accepts upload_addr override.
• xhs_cli/commands/creator.py — adds post_video command with validation; threads uploadAddr into the existing post command's image upload.
• xhs_cli/cli.py — registers post-video.
• xhs_cli/formatter_renderers.py — fixes a stale import-order lint carryover.
• README.md — documents post-video in both English and Chinese sections.

Notes for reviewers

• I deliberately skipped the upstream PR's PR_DESCRIPTION.md and test_video.mp4 files — both look like leftover scratch from the author's local repo, not source-of-truth.
• I left out the upstream PR's commit [bundler-runtime…] test artifact for the same reason.

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