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/results/source_files/6ec1bdd4054b.txt

@@ -0,0 +1,3 @@
+REACT_APP_GEMINI_API_KEY=AIzaSyCvZbX62rkQNjef4xCHh0dHu-5B-CrHRQg
+REACT_APP_GLM_API_KEY=0cc1bd7dee85113504b05933dd543e4c.glXfJ24l00qHQS6u
+REACT_APP_MISTRAL_API_KEY=K6XwemuqBLy2wuKXSHMvsjX0ebq0Bh6L