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/kimi_v2/unknown.txt

@@ -0,0 +1,2 @@
+sk-S9S3CANDkrBVCm1N8GuCQADLb6lDudLGqZowbyJ9VnZxOukT|https://github.com/Riderich/psycho_benchmark/blob/413fd181f17043165b9f8ccda361109cf1240026/script/json_processor_api.py|network: URLError: <urlopen error _ssl.c:975: The handshake operation timed out>
+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|https://github.com/ArtisanCloud/RobotChat/blob/1f6985deb3c4204d2c198197ad1eec3e9b8b4655/config-example.yaml|network: URLError: <urlopen error _ssl.c:975: The handshake operation timed out>