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_22_sk-cp-yaQLNxyfN5h7MJko.txt

@@ -0,0 +1,7 @@
+PROVIDER : minimax - MiniMax Coding Plan
+KEY      : sk-cp-yaQLNxyfN5h7MJkoB7ZC_DZ6NbDlY94R45IRuP-9tTLDzTzaL2QXztsd0QTm75k6vRvn3CtIC63OvZivQoH-c6G11gNoza-GaiYO1McIa-VPJF9gqENHXv4
+DETAIL   : https://api.minimaxi.com/v1 chat OK: '<think>\nThe user has simply sa'
+SOURCE   : https://github.com/yys233-pudding/FocusMind_LangGraph_MCP_Demo/blob/840d45d73b62709ce41579b54eec34ad4a2611f4/.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