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/pivot/no_balance.txt

@@ -0,0 +1,2 @@
+sk-64ba741ee60d400b98be80ff82189a4b	binbinyu99-crypto/wuxing-flywheel/philosophies/08_cognitive_science_memory_learning/cognitive_apis_v2.py	chat HTTP 402: {"error":{"message":"Insufficient Balance","type":"unknown_error","param":null,"code":"invalid_reque
+sk-vpmpbtccfubhujvleqpnxgmhrowggbioouqshcuscfrijmgh	mrzhang-developer/newchatbiproject/.env	chat HTTP 402: {"code":30001,"message":"Sorry, your account balance is insufficient","data":null}