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/b9b1a3c395f2.txt

@@ -0,0 +1,4 @@
+SPARKAI_APP_ID="e7780d16"
+SPARKAI_API_SECRET="OTU2YTlmZTgwYzA4MTFiMjA5NTViZWE4"
+SPARKAI_API_KEY="876b6f734b4c3764928b2b560a8bf387"
+ZHIPUAI_API_KEY="2b751973b7a0af6800221600fc033aa3.SiO2uvncWNQ3V1eo"