Feedback on Waku and Astro

feedbackPlugin(), githubFeedbackPlugin() and emailFeedbackPlugin() work on Waku and Astro, and fumapress is no longer a peer dependency.
Page feedback is the feedback:page slot item, props.slots["feedback:page"] in ui.renderPage.
Changed: actions of feedbackPlugin() run on the server at /api/feedback/page and /api/feedback/text instead of as Server Functions. A Response an action throws is the answer.
Actions exported from 'use client' modules run in the browser, also on a site without a server.
feedbackPlugin() accepts beforeRequest, like the integrations.
githubFeedbackPlugin() finds the existing discussion of a page instead of opening a new one for each feedback.
Feedback routes answer 400 to invalid JSON.