fix(middleware): prevent premature redirect to /login during loading

Users were incorrectly redirected to /login during the initial loading phase
before the loading was actually complete. Added loading_started and
loading_complete flags to properly track the initialization state so
the setup redirect middleware knows when it's safe to redirect.

Docs/NAVIGATION.md

@@ -108,6 +108,7 @@ The middleware checks the current state and redirects accordingly:
 | Flag | Purpose |
 |------|---------|
 | `setup_complete` | Initial configuration was saved |
+| `loading_started` | Loading phase has been initiated (redirected to /loading) |
 | `unresolved_completed` | User clicked "Done" on unresolved page |
 | `loading_complete` | Series scan + initial loading finished |
 | `nfo_scan_complete` | Final NFO scan finished |

Docs/key

@@ -1,3 +1,7 @@
 API key : 299ae8f630a31bda814263c551361448
 9bc3e547caff878615cbdba2cc421d37
 
+/setup
+
+
+SeriesApp initialized for directory: