feat(providers): audit — 32 AI answer engines missing from provider registry

Description

Audit of 32 AI answer engines not yet in OmniRoute's provider registry. Each slots in as an **answer-engine provider** (same shape as existing `chatgpt-web`, `gemini-web`, `doubao-web`). Follow-up to #6190. ## LIVE — safe to add (18) | Engine | Launch | URL | |---|---|---| | Andi | 2022-03-28 | https://andisearch.com | | Consensus | 2022-09-08 | https://consensus.app | | Pi | 2023-05-02 | https://pi.ai | | Liner | 2023-05-18 | https://liner.ai | | Tiangong | 2023-07-20 | https://www.tiangong.cn | | Nano AI | 2024-01-24 | https://n.cn | | Xdash AI | 2024-02-27 | https://xdash.ai | | ThinkAny | 2024-03-22 | https://thinkany.ai | | Metaso.cn | 2024-03-27 | https://metaso.cn | | Brave Search AI | 2024-04-17 | https://search.brave.com | | AyeSoul | 2024-06-20 | https://ayesoul.com | | Felo | 2024-09-04 | https://felo.ai | | iAsk Ai | 2024-09-11 | https://iask.ai | | Deepfind | 2024-10-14 | https://deepfind.co | | Ithy | 2025-02-26 | https://ithy.com | | ColomboAI | 2025-02-27 | https://colomboai.com | | Lumo (Proton) | 2025-07-23 | https://lumo.proton.me | | Yahoo Scout | 2026-01-27 | https://scout.yahoo.com | ## LIVE_GATED — needs auth work (10) | Engine | Launch | URL | Gate | |---|---|---|---| | SciSpace | 2022-11-23 | https://scispace.com | freemium signup | | Kagi FastGPT | 2023-04-26 | https://kagi.com/fastgpt | paid | | Poe | 2023-12-27 | https://poe.com | signup | | Duck.ai | 2024-06-06 | https://duck.ai | free cap + paid | | Genspark | 2024-06-18 | https://genspark.ai | signup + $24.99/mo | | Monica | 2024-06-24 | https://monica.im | signup + paid | | uncovr | 2024-07-29 | https://uncovr.app | sign-in | | Kagi Assistant | 2024-09-24 | https://kagi.com/assistant | paid | | ChatGPT Deep Research | 2025-02-02 | https://chatgpt.com | Plus/Pro paywall | | MiroThinker | 2025-08-07 | https://mirothinker.ai | live global; CN/HK/MO suspended 2026-05-12 | ## GEO_BLOCKED (0) None. ## DEAD / REDIRECTED — skip (4) 4 skipped: Arc Search (discontinued, Atlassian acquisition), Msty (→msty.ai), AI Hay (parked page), LMArena (→arena.ai rebrand). Thanks for the great work on OmniRoute!