Two filter bugs caused every activity to be silently dropped:
1. Path format: Nextcloud activity API returns paths as
/username/files/bands/... but is_band_audio_path() was checking
parts[0] == "bands" after strip("/"), getting "username" instead.
Fix: normalize_nc_path() strips the /username/files/ and DAV prefixes
before any path checks are applied.
2. Subject names: filter was checking for "file_created"/"file_changed"
but Nextcloud uses "created_by"/"changed_by"/"created_self"/etc.
Fix: expanded _UPLOAD_SUBJECTS to cover all known NC activity subjects.
3. Expose NextcloudWatcherClient.username so normalize_nc_path() can
construct the correct prefix for the configured user.
4. Set watcher log level to DEBUG with per-activity skip reasons logged,
so the next filter edge case is immediately diagnosable. httpx/httpcore
kept at INFO/WARNING to avoid flooding the output.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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