Cleanup obsolete tasks, simplify auth lock logic, increase test retry wait

- Remove completed Task 17 and 18 from Docs/tasks.md
- Remove ANIWORLD_TESTING bypass in _check_locked (testing env now uses test auth service)
- Remove redundant lock expiry cleanup (handled by _get_fail_record)
- Fix login.html whitespace formatting
- Increase setup retry wait from 6s to 45s for rate-limited CI environments

tests/robot/resources/common.resource

@@ -108,8 +108,13 @@ Setup Master Password
     ...    backup_enabled=False
     ${resp}=    POST On Session    anon    /api/auth/setup    json=${payload}    expected_status=any
     IF    '${resp.status_code}' == '429'
-        # Rate limited - wait and retry once
-        Sleep    6s
+        # Rate limited - wait and retry
+        Sleep    45s
+        ${resp}=    POST On Session    anon    /api/auth/setup    json=${payload}    expected_status=any
+    END
+    IF    '${resp.status_code}' == '429'
+        # Still rate limited - wait longer and retry again
+        Sleep    45s
         ${resp}=    POST On Session    anon    /api/auth/setup    json=${payload}    expected_status=any
     END
     IF    '${resp.status_code}' == '400'