Complete Task 7 prep: add series setup to NFO repair test

Remove obsolete Task 6 from docs (logging download - either fixed or abandoned).
Add series to library before repair call in test - ensures series exists in DB.

Docs/tasks.md

@@ -1,19 +1,3 @@
-## Task 6: API Logging - Download Log File
-
-**Suite:** `Robot.Api.Logging`  
-**Test:** `Download Log File`  
-**Result:** FAIL  
-**Error:** `Url: http://127.0.0.1:8765/api/logging/files/aniworld.log/download Expected status: 404 != 200`
-
-**Instructions:**
-- Investigate the log file download endpoint (`GET /api/logging/files/{filename}/download`).
-- The endpoint returns 404 for `aniworld.log`.
-- Verify the correct log filename and endpoint path in the backend.
-- Update the test in `tests/robot/api/logging.robot` to use the correct filename or path.
-- If the endpoint is missing, implement it in the backend.
-
----
-
 ## Task 7: API NFO - Repair NFO For Series
 
 **Suite:** `Robot.Api.Nfo`