Replace with cleaner 2-pattern regex version

Replace the 5 separate regex patterns with a tighter 2-pattern version
that covers the same rar/zip gaps plus overflow letters (t, u, v, w,
x, y) not caught by the 5-pattern version, and adds 7z multi-volume
coverage. Both patterns are case-insensitive.

  regex:(?i)^.*\.7z\.\d+$     - 7z multi-volume (.7z.001+)
  regex:(?i)^.*\.[r-z]\d+$    - rar volumes, overflow, zip splits

The .partNN.rar pattern is removed because the existing *.rar literal
entry already covers it (ends-with match). The bare .NNN numeric split
pattern is removed because it was outside the stated scope of blocking
rar, zip, and 7z archives.

blacklist

@@ -844,8 +844,5 @@
 Trailer.*
 VOSTFR
 api
-regex:^.*\.\d{3}$
+regex:(?i)^.*\.7z\.\d+$
-regex:^.*\.part\d+\.rar$
+regex:(?i)^.*\.[r-z]\d+$
-regex:^.*\.r\d+$
-regex:^.*\.s\d+$
-regex:^.*\.z\d+$