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/live/intl/nvidia-nim/key.txt

@@ -0,0 +1 @@
+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

tools/scripts/llm-key-hunter/results/live/intl/nvidia-nim/keys.txt

@@ -0,0 +1,5 @@
+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
+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
+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
+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
+nvapi-AlLf8uyF+VaGY8VICU2TUtDux4ZW9WQjc6rBegA4Dpg8D-cx63RI_-bQHZg-eyOY9