Add Doris Schoolhouse and clean pending homelab changes

home/doris-schoolhouse/app/services/diagnostics.py

@@ -0,0 +1,23 @@
+from pathlib import Path
+
+from app.config import settings
+from app.services.media import MediaService
+from app.services.repository import get_repository
+
+
+class DiagnosticsService:
+    def collect(self) -> dict:
+        repo = get_repository()
+        media = MediaService()
+        return {
+            'backend': repo.backend,
+            'state_dir': settings.state_dir,
+            'state_dir_exists': Path(settings.state_dir).exists(),
+            'upload_tmp_dir': settings.upload_tmp_dir,
+            'upload_tmp_dir_exists': Path(settings.upload_tmp_dir).exists(),
+            'ffmpeg_path': media.ffmpeg_path(),
+            'can_convert_audio': media.can_convert(),
+            'n8n_base_url': settings.n8n_base_url,
+            'paperless_base_url': settings.paperless_base_url,
+            'd2l_scraper_workdir': settings.d2l_scraper_workdir,
+        }