feat: update for Nextcloud 33 and refactor Talk integration

Channel list working, url generation, just need posting working now

- Update dependency to Nextcloud 33 and add `spreed` dependency
- Change webhook route from `/webhook` to `/bot-webhook`
- Add `NavigationProvider` to add app to admin settings menu
- Refactor `TalkService` to query Talk DB directly for room listing (public channels)
- Update `postToRoom` to use Talk Chat API with Basic Auth for `talk-bot` user
- Add debug helper methods to `TalkService` for room debugging
- Enhance `debug` endpoint with detailed system and Talk configuration info
- Update admin settings UI with "Default Sender Name" field and improved room selection
- Add localization strings to admin settings
- Update documentation (`INSTALL.md`, `README.md`) for new route and bot admin requirement
- Improve `getBaseUrl` logic to prioritize `trusted_domains` for Docker compatibility

appinfo/info.xml

@@ -12,7 +12,8 @@
     <category>integration</category>
 
     <dependencies>
-        <nextcloud min-version="28" max-version="33"/>
+        <nextcloud min-version="33" max-version="33"/>
+        <app>spreed</app>
     </dependencies>
 
     <background-jobs>