Feature: Request sharing (generate shareable request links)

[cedric05]

Add a request-sharing feature to dothttp to generate shareable links for requests or collections. Links should be safe (no tokens/passwords by default), support optional included response snapshots, expiry/TTL, and a simple web viewer that shows the request and allows execution or import into the user's dothttp environment.

Goals:

• Enable easy sharing of runnable requests with teammates and docs
• Provide CLI and VSCode actions to generate and copy links
• Provide server-side storage for links and optional analytics (views, executions)

Proposed Commands/UI:

• CLI: dothttp users.http --share --request @name("Get User") --ttl 7d
• VSCode: Right-click → Share Request (dialog with options: include response, TTL, private/public)
• Web: https://dothttp.dev/share/{id} - display request, allow filling env vars and executing

Acceptance criteria:

• CLI produces sharable link
• Server stores minimal request metadata and enforces TTL
• Web viewer renders request details and allows copy-as-curl
• Shared links do not include Authorization tokens by default

Implementation notes:

• Accept optional encryption for link payloads for private shares
• Add analytics to measure usage