feat(gallery): consolidate 25 pending gallery PRs (#12124)

Consolidates all 25 pending gallery bot PRs into a single merge to resolve
the conflict cascade — every PR branched from a different point in master
and they all touch gallery/index.yaml, so merging them individually was
blocked by constant conflicts.

Changes:
- gallery/index.yaml: +739 lines (new model entries and fixes)
- docs/content/features/model-gallery.md: +116 lines (new model docs)
- docs/content/features/audio-cpp.md: +12 lines (Sortformer checksum fix)

Entry count: 1597 -> 1890 (293 new entries, no duplicates, YAML validated).

Supersedes: #11986 #11992 #11994 #11996 #11999 #12002 #12017 #12019
#12021 #12025 #12027 #12029 #12032 #12036 #12037 #12038 #12041 #12042
#12043 #12047 #12050 #12064 #12065 #12066 #12118

Assisted-by: MAKI:regolo/glm5.2

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Co-authored-by: Ettore Di Giacinto <mudler@localai.io>

docs/content/features/audio-cpp.md

@@ -33,6 +33,18 @@ an available compute backend, with CPU as the fallback. To force CPU execution,
 replace that option with `backend:cpu`. Model configurations that omit this
 option still default to CPU.
 
+### Sortformer installation
+
+Install the Sortformer model for speaker diarization from the gallery:
+
+```bash
+local-ai models install audio-cpp-sortformer-diarization
+```
+
+If installation fails with `SHA mismatch`, compare the reported metadata checksum
+with the current gallery entry. An outdated gallery checksum can reject a complete
+download. Report a persistent mismatch with both checksum values and the model name.
+
 ## What it serves
 
 One model serves one family, and a family advertises the tasks it can perform. The