[codex] Add Cubox platform adapters and Chinese tagging

[lichengtao97]

Summary

Implements the first Cubox-alignment slice for Karakeep:

• Adds a worker-side platform adapter framework with a WeChat adapter.
• Routes matched URLs through adapters before falling back to the generic crawler.
• Stores platform extraction metadata and adapter logs in the database.
• Downloads WeChat cover and inline images into assetdb with the required Referer and rewrites article HTML to local asset URLs.
• Adds Chinese-first AI tagging prompts using platform metadata and Chinese tag synonym normalization.
• Keeps the existing post-crawl pipeline intact for tagging, summarization, search reindexing, webhooks, and video handling.

Validation

Focused checks run locally:

• npx pnpm@9.15.9 --filter @karakeep/workers run format
• npx pnpm@9.15.9 --filter @karakeep/workers run lint
• npx pnpm@9.15.9 --filter @karakeep/workers run typecheck
• npx pnpm@9.15.9 --filter @karakeep/workers run test
• npx pnpm@9.15.9 --filter @karakeep/shared run format
• npx pnpm@9.15.9 --filter @karakeep/shared run lint
• npx pnpm@9.15.9 --filter @karakeep/shared run typecheck
• npx pnpm@9.15.9 --filter @karakeep/shared run test
• npx pnpm@9.15.9 --filter @karakeep/db run typecheck
• npx pnpm@9.15.9 --filter @karakeep/trpc run typecheck

Manual verification:

• Started local web and workers with SQLite data dir.
• Added WeChat public account articles and verified adapter extraction, inline image asset rewriting, and AI tagging via an OpenAI-compatible Zhipu endpoint.

Notes

The full workspace typecheck still has an unrelated blocker in apps/landing: Astro requires Node >=22.12.0 while this local shell is using Node 20.17.0.

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[MohamedBassem]

I'm not sure what exactly is going on here but please make sure you read the contribution guidelines of karakeep before sending PRs.