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/dashscope/key_03_sk-35a9d91648fa40b6b.txt

@@ -0,0 +1,7 @@
+PROVIDER : dashscope - Alibaba DashScope (通义千问 Qwen)
+KEY      : sk-35a9d91648fa40b6b8b6dc7aec566ea2
+DETAIL   : OK {"model":"qwen-plus","id":"chatcmpl-d95fcae3-0f7f-9ec5-affc-
+SOURCE   : https://github.com/heazeel/leetcode_solution/blob/9e7357d99f0c6fa454b1d6957ab83466773d8dad/crow/src/constants.ts
+BASE_URL : https://dashscope.aliyuncs.com/compatible-mode/v1
+MODELS   : ['qwen-plus', 'qwen-turbo', 'qwen-max']
+VERIFIED : 2026-08-01 13:21 UTC