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/china/longcat/README.md

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+# Meituan LongCat (美团龙猫)
+
+## Endpoints
+- OpenAI: https://api.longcat.chat/openai/chat/completions
+- Anthropic: https://api.longcat.chat/anthropic/v1/messages
+
+## Auth
+- OpenAI: Authorization: Bearer <key>
+- Anthropic: Authorization: Bearer <key> (NOT x-api-key!)
+
+## Key Format
+ak_ + 29 alphanumeric chars
+
+## Usable Key
+Key: ak_2yp3Xw1Ny7ky2pF7er9x93ZO9jj6G
+Source: https://github.com/blackeagle686/giyu-agent/blob/8375b86c7374b2a33c6722847b289ee03e84c67a/.env
+Model: LongCat-2.0 (1.6T MoE, 1M context)
+Status: ✅ Confirmed usable on both OpenAI and Anthropic endpoints
+
+## Other keys found (valid but no quota)
+- ak_1pB1di1eE5a90uq6Yu2Z62qG3xw2P (mytahir/SaudiCitiesAI) — 额度不足
+- ak_1256Qm5xJ39C2gf9Lq6hu6pA4Pc3d (275145/WayfinderAI) — 额度不足
+- ak_1TN7xS99s7dV4Ao95q3fN06G2Av7X (AyanArjumand) — 额度不足
+- ak_2b45eX3PQ1eQ7wh4Uz3jB3vd2Xr4E (honey3031) — 额度不足
+- ak_2jA5hc9ZF4ug9yJ7xl6JI8rs3wg7K (Ljp-c/BMADframework) — 额度不足
+- ak_2y49n00xY96g3nI5ZD4yI8Pg6R54M (Hashir-Akram) — 额度不足
+
+## Usage
+```bash
+# OpenAI format
+curl https://api.longcat.chat/openai/chat/completions \
+  -H "Authorization: Bearer ak_2yp3Xw1Ny7ky2pF7er9x93ZO9jj6G" \
+  -H "Content-Type: application/json" \
+  -d '{"model":"LongCat-2.0","messages":[{"role":"user","content":"hi"}],"max_tokens":100}'
+
+# Anthropic format
+curl https://api.longcat.chat/anthropic/v1/messages \
+  -H "Authorization: Bearer ak_2yp3Xw1Ny7ky2pF7er9x93ZO9jj6G" \
+  -H "anthropic-version: 2023-06-01" \
+  -H "Content-Type: application/json" \
+  -d '{"model":"LongCat-2.0","messages":[{"role":"user","content":"hi"}],"max_tokens":100}'
+```

tools/scripts/llm-key-hunter/results/live/china/longcat/key.txt

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+ak_2yp3Xw1Ny7ky2pF7er9x93ZO9jj6G