适配v0.26.1

Update endpoints and metadata to match newer memos backend and record new maintainer.

- js/oper.js: switch upload endpoint to api/v1/attachments; replace auth/status POST with auth/me GET and adapt response parsing to response.user.name; stop using user-scoped memo endpoints and use api/v1/memos for tag/search/random requests; fix memo link path to /memos/{uid}.
- manifest.json: bump extension version to 2026.02.22 and update homepage_url to the GitHub repo.
- README.md: add maintainer note, compatibility (v0.26.1) and a collapsible details block.

These changes align the extension with backend API changes and mark the new maintenance status.

manifest.json

@@ -2,14 +2,14 @@
    "manifest_version": 3,
    "name": "__MSG_extName__",
    "default_locale": "en",
-   "version": "2025.03.29",
+   "version": "2026.02.22",
    "action": {
       "default_popup": "popup.html",
       "default_icon": "assets/logo_24x24.png",
       "default_title": "__MSG_actionTitle__"
    },
    "description": "__MSG_extDescription__",
-   "homepage_url": "https://immmmm.com",
+   "homepage_url": "https://github.com/Jonnyan404/memos-bber",
    "icons": {
       "128": "assets/logo.png",
       "16": "assets/logo.png",