feat: add 知识星球(zsxq) site adapter

[xtftbwvfp]

Summary

Add cookie-based site adapter for 知识星球 (zsxq.com) with 5 commands:

Command	Description
opencli zsxq groups	List joined groups
opencli zsxq topics	List topics in current group
opencli zsxq topic <id>	Get single topic detail with comments
opencli zsxq search <keyword>	Search topics within a group
opencli zsxq dynamics	Latest cross-group activity feed

Implementation Details

• Strategy: Strategy.COOKIE with browser: true
• API: Calls https://api.zsxq.com/v2/ endpoints via XHR in Chrome (credential forwarding)
• Auth detection: Validates login by attempting a lightweight API call instead of checking cookies (zsxq uses httpOnly cookies on different subdomains)
• Default group: Reads from localStorage or falls back to first joined group from API
• Search: Resolves group name via groups API for display

Files Added

src/clis/zsxq/

• utils.ts — Shared types, API helper, response parsing
• groups.ts — List joined groups
• topics.ts — List topics (with pagination via count)
• topic.ts — Single topic detail + comments
• search.ts — Search within a group
• dynamics.ts — Cross-group activity feed

Testing

Tested with 5 joined groups, all commands return correct data.