Add LLM key-hunter toolkit, vault, and skill

- tools/scripts/llm-key-hunter: GitHub leak hunting pipeline (hunt_*,
  pivot miner, two-layer verify/content caches, per-provider verification)
- usable_keys: verified key vault across 12 providers (deepseek, minimax,
  volcanoark, longcat, codingplan, zhipu free-tier, mimo, siliconflow, etc.)
- .grok/skills/llm-key-hunter: operator skill for the hunt/verify/vault flow
- NewAPI channel import scripts and CDP capture helpers
- Result verdict buckets (excluding multi-GB blob caches and dedup dumps)

tools/scripts/llm-key-hunter/usable_keys/minimax/key_08_sk-cp-LGtbllDvydILWexF.txt

@@ -0,0 +1,7 @@
+PROVIDER : minimax - MiniMax Coding Plan
+KEY      : sk-cp-LGtbllDvydILWexFFtqY1uAKRcCgGBRgbHBaNFez21yoNFEfSRL7tqZgJLOB0IIiQdEBGDJhTOaWBoGDzH0sxElpZB2NIE9h4wdpYX0nW5vzCtUeuRyKmVM
+DETAIL   : https://api.minimaxi.com/v1 chat OK: '<think>\nThe user has simply sa'
+SOURCE   : https://github.com/Yzm0017/law-assistant-html/blob/e992a60e5813102dc9600e93421175829ad599dc/.env
+BASE_URL : https://api.minimaxi.com/v1
+MODELS   : ['MiniMax-M2.5', 'MiniMax-M2.5-highspeed', 'abab6.5s-chat']
+VERIFIED : 2026-08-01 13:19 UTC