feat(providers): integrate audited free-tier gateways (#9210)

* feat(providers): add Zylo UnoRouter and Poolside registries

* feat(providers): integrate audited free-tier gateways

* feat: add wave2 free-tier provider registries

* feat(providers): add Mixlayer Speka and TokenReply registries

* feat: add wave 2 free-tier provider registries

* fix: align meganova provider slug

* feat(providers): integrate wave2 free-tier gateways

* feat(providers): add Wave 3-A free-tier registries

* feat(providers): add HelyxAI Auriko and Poixe registries

* feat(providers): add Naga AI and Chat Oripe registries

* feat(providers): integrate wave3 free-tier gateways

* feat(providers): add FreeInference registry

* feat(providers): add Free.ai registry

* feat(providers): integrate wave4 free-tier gateways

* docs: synchronize provider and free-tier inventories

* refactor(providers): split audited gateway catalog

* feat(providers): add audited Void AI and HelixMind gateways

* feat(providers): finalize audited free-tier integration

* test(providers): update APIKEY split count to 229 after rebase onto release/v3.8.50

The rebase merged the release catalog (201 APIKEY providers) with the PR's
28 free-tier additions, yielding 229 total. Correct the characterization
count so the partition assertion reflects the true merged state.

---------

Co-authored-by: diegosouzapw <diegosouzapw@users.noreply.github.com>
Co-authored-by: backryun <bakryun0718@proton.me>

docs/compression/COMPRESSION_GUIDE.md

@@ -199,7 +199,7 @@ In `Dashboard → Context & Cache → Compression Combos`, assign a compression
 combo:
 
 ```txt
-Combo: "free-forever"
+Combo: "free-tier-fallback"
   Compression Combo: "coding-agent-stack"
   Pipeline: RTK -> Caveman
   Targets: